From Middle English double, from Old French doble, double, from Latin duplus.

• (RP) IPA: /ˈdʌb(ə)l/
• (America) IPA: /ˈdʌb(ə)l/, [ˈdʌb.ɫ]

double (not comparable)

1. Made up of two matching or complementary elements.

   The closet has double doors.

   • 1910, Emerson Hough, “A Lady in Company”, in The Purchase Price: Or The Cause of Compromise, Indianapolis, Ind.: The Bobbs-Merrill Company, →OCLC ↗:

     “ […] it is not fair of you to bring against mankind double weapons ! Such is not the usage of civilized warfare. Dangerous enough you are as woman alone, without bringing to your aid those gifts of mind suited to problems which men have been accustomed to arrogate to themselves.”

2. Of twice the quantity.

   Give me a double serving of mashed potatoes.

3. Of a family relationship, related on both the maternal and paternal sides of a family.

   He's my double cousin as my mother's sister married my father's brother.

4. Designed for two users.

   a double room

5. Folded in two; composed of two layers.
6. Stooping; bent over.
7. Having two aspects; ambiguous.

   a double meaning

8. False, deceitful, or hypocritical.

   a double life

   • c. 1515–1516, published 1568, John Skelton, Againſt venemous tongues enpoyſoned with ſclaunder and falſe detractions &c.:

     A fals double tunge is more fiers and fell
     Then Cerberus the cur couching in the kenel of hel;
     Wherof hereafter, I thinke for to write,
     Of fals double tunges in the diſpite.

9. Of flowers, having more than the normal number of petals.
10. (music) Of an instrument, sounding an octave lower.

    a double bass

11. (music) Of time, twice as fast.

• (made up of two matching or complementary elements) binary, twin; see also Thesaurus:dual
• (twice the quantity) duplicate, twofold; see also Thesaurus:twofold
• (having two aspects) twofold

• (antonym(s) of “made up of two matching or complementary elements”): half
• (antonym(s) of “of twice the quantity”): half

• French: double
• German: doppelt
• Italian: doppio, doppia
• Portuguese: duplo
• Russian: двойно́й
• Spanish: doble, duplo (not often used), dúplex

• French: double
• German: doppelt
• Italian: doppio
• Portuguese: dobro
• Russian: двойно́й
• Spanish: doble

• German: doppel-
• Russian: двойно́й
• Spanish: doble

• German: doppellagig, zweilagig
• Spanish: doblado, bicapa

• Spanish: encorvado, doblado

• German: doppelt
• Spanish: doble

• German: doppel-
• Spanish: doble

• German: gefüllt
• Spanish: doble

• German: kontra-

double (not comparable)

1. Twice over; twofold; doubly.
   • February 7 1736, Jonathan Swift, letter to Alexander Pope

     I was double their age.

2. Two together; two at a time.

   When I met the twins, I thought I was seeing double.

   There are only a few beds, so some of the children will have to sleep double for the night.

3. Into two halves or sections.

   The old man was bent double under his heavy burden.

• (twice over) doubly; see also Thesaurus:twice

double (plural doubles)

1. Twice the number, amount, size, etc.
2. A person who resembles and stands in for another person, often for safety purposes

   Saddam Hussein was rumored to have many doubles.

3. A drink with two portions of alcohol.

   On second thought, make that a double.

4. A ghostly apparition of a living person; a doppelgänger.
5. A sharp turn, especially a return on one's own tracks.
6. A redundant item for which an identical item already exists.

   I have more than 200 stamps in my collection but they're not all unique: some are doubles.

   Before printing the photos, Liam deleted the doubles.

7. (baseball) A two-base hit.

   The catcher hit a double to lead off the ninth.

8. (bridge) A call that increases certain scoring points if the last preceding bid becomes the contract.
9. (billiards, snooker) A strike in which the object ball is struck so as to make it rebound against the cushion to an opposite pocket.
10. A bet on two horses in different races in which any winnings from the first race are placed on the horse in the later race.
    • 2005, Kenneth Brown, ...and I Survived: A Barnardo Boy's Memoir, page 55:

      Not only did I collect on the double; I had the win and the place money as well.

11. (darts) The narrow outermost ring on a dartboard.
12. (darts) A hit on this ring.
13. (dominoes) A tile that has the same value (i.e., the same number of pips) on both sides.
14. (programming) A double-precision floating-point number.

    The sine function returns a double.

15. (soccer) Two competitions, usually one league and one cup, won by the same team in a single season.
16. (rowing) A boat for two scullers.
17. (sports) The feat of scoring twice in one game.
18. (sports, chiefly, swimming and track) The feat of winning two events in a single meet or competition.

    In 1996, Michael Johnson achieved a double by winning both the 200 and 400 meter dashes.

19. (historical) A former French coin worth one-sixth of a sou.
20. (historical, Guernsey) A copper coin worth one-eighth of a penny.
    • 1974, GB Edwards, The Book of Ebenezer Le Page, New York, published 2007, page 196:

      As for doubles, they are not worth anything now; and I have still got an egg-cupful my mother used to keep handy to give the baker change from a farthing.

21. (music) Playing the same part on two instruments, alternately.
22. (Christianity) A double feast.
23. Synonym of double-quick
24. (music) A secondary instrument with which a musician is skilled.

• French: double
• German: Doppelte
• Italian: doppio
• Portuguese: dobro
• Spanish: doble

• French: double, sosie
• German: Doppelgänger, Double
• Italian: sosia, doppione
• Portuguese: sósia
• Russian: двойни́к
• Spanish: doble, sosias

• French: double
• German: Doppelter
• Italian: doppio
• Russian: двойно́й
• Spanish: doble

• French: doublon
• Italian: doppione

double (doubles, present participle doubling; simple past and past participle doubled)

1. (transitive) To multiply by two.

   The company doubled their earnings per share over last quarter.

2. (intransitive) To increase by 100%, to become twice as large in size.

   Our earnings have doubled in the last year.

3. To be the double of; to exceed by twofold; to contain or be worth twice as much as.
   • 1667, John Dryden, Annus Mirabilis: The Year of Wonders, 1666. […], London: […] Henry Herringman, […], →OCLC ↗, stanza 119, [https://archive.org/details/bim_early-english-books-1641-1700_annus-mirabilis-_dryden-john_1667/page/(31)/mode/1up page 31]:

     Thus re-inforc’d, againſt the adverſe Fleet / Still doubling ours, brave Rupert leads the way.

4. (transitive) To fold over so as to make two folds.

   To make a pleat, double the material at the waist.

5. (transitive, sometimes followed by up) To clench (a fist).
6. (baseball) To get a two-base hit.

   The batter doubled into the corner.

7. (transitive, often followed by together or up) To join or couple.
8. (transitive) To repeat exactly; copy.
9. (intransitive) To serve a second role or have a second purpose. [with as]

   A spork is a kind of fork that doubles as a spoon.

10. (ambitransitive, sometimes with "for") To act as substitute for (another theatrical performer in a certain role, etc).
    • 1801, Francis William Blagdon, Paris as it was and as it is, published 1803, II, xli, 60:

      Laforêt, who (as the French express it), doubles Lainez, that is, performs the same characters in his absence.

    • 1814, Elizabeth Hervey, The Mourtray Family: Third Edition, page 31:

      […] and when she attempted to double the part of her mother, she equally failed in playing the great or agreeable lady.

11. (theatre) To play (both one part and another, in the same play, etc).
    • 1916, The Moving Picture World, page 335:

      Miss Theby doubles in the part of Rose and the native girl in the Philippines. This is a problem plot in which a young man leaves the girl of his choice because she has had an affair in her earlier years. He goes to the Philippines, […]

12. (intransitive) To turn sharply, following a winding course.
13. (nautical) To sail around (a headland or other point).
    • 1603, Richard Knolles, The Generall Historie of the Turkes, […], London: […] Adam Islip, →OCLC ↗:

      Sailing along the coast, he doubled the promontory of Carthage.

    • 1719 May 6 (Gregorian calendar), [Daniel Defoe], The Life and Strange Surprizing Adventures of Robinson Crusoe, […], London: […] W[illiam] Taylor […], →OCLC ↗, page 162 ↗:

      […] though the Iſland itſelf was not very large […] I found a great Ledge of Rocks lie out about two Leagues into the Sea […] ſo that I was oblig’d to go a great Way out to Sea to double the Point.

14. (music) To duplicate (a part) either in unison or at the octave above or below it.
15. (music, intransitive, usually followed by "on") To be capable of performing (upon an additional instrument).
16. (bridge) To make a call that will double certain scoring points if the preceding bid becomes the contract.
17. (card games, intransitive) To double down.
18. (billiards, snooker, pool) To cause (a ball) to rebound from a cushion before entering the pocket.
19. (intransitive) To go or march at twice the normal speed.
    • 1919, W[illiam] Somerset Maugham, chapter XLVII, in The Moon and Sixpence, [New York, N.Y.]: Grosset & Dunlap Publishers […], →OCLC ↗, page 250 ↗:

      "You double down to the harbour, my lad," said the Captain to Strickland, "and sign on. You've got your papers."
      Strickland set off at once, and that was the last Captain Nichols saw of him.

20. (transitive) To multiply the strength or effect of by two.

    Sorry, this store does not double coupons.

21. (military) To unite, as ranks or files, so as to form one from each two.
22. (radio, informal, of a station) To transmit simultaneously on the same channel as another station, either unintentionally or deliberately, causing interference.

    Could you please repeat your last transmission? Another station was doubling with you.

23. (espionage, intransitive) To operate as a double agent.
    • 1973, National Lampoon, page 12:

      Was this simply the cover name of an Allied spy-code named the Brass Monkey? […] The possibility that the Brass Monkey himself was "doubling" (with headquarters' approval, of course) is too logical […]

• (to multiply by two) redouble; see also Thesaurus:double
• (to repeat exactly; copy) facsimilize; see also Thesaurus:duplicate

• (antonym(s) of “to multiply by two”): halve; see also Thesaurus:bisect

• French: doubler
• German: verdoppeln, doppeln, verzweifachen
• Italian: doppiare
• Portuguese: dobrar, duplicar
• Russian: удва́ивать
• Spanish: duplicar, doblar

• German: verdoppeln, verzweifachen
• Russian: удва́иваться
• Spanish: duplicar

• German: verdoppeln
• Portuguese: dobrar
• Spanish: doblar

• German: ballen
• Spanish: apretar

• Spanish: emparejar

• Spanish: duplicar

• German: doubeln
• Spanish: hacer las veces de

• Spanish: doblar, torcer

• Spanish: circunnavegar

• German: kontrieren
• Spanish: doblar

• German: doubeln
• Spanish: ser doble de, hacer de doble de

• German: doppeln
• Spanish: duplicar la velocidad

• Spanish: duplicar, acumular doblemente

1. Surname.

double (plural Doubles)

1. (US, motorsport) Collectively, both the Indianapolis 500, a day race, and the Coca-Cola 600, an evening race, both of which are run on Memorial Day weekend Sunday. Used concerning racers who (wish[/ed/ing] to) participat[e/ed/ing] in both events, typically using a private jet to travel between Indianapolis, Indiana, after the 500 and Charlotte, North Carolina, to get to the 600.