From metathesis of Middle English crulle, from Middle Dutch crul, crulle, ultimately from Proto-Germanic *kruzlǭ, of unknown origin; possibly from Pre-Germanic *grus-, contracted from Proto-Indo-European *gurus-, same source as Persian گرس.

Cognate with Saterland Frisian Krulle, Western Frisian krul, Dutch krul, nds-de Krull, dialectal German Krolle, Danish krølle, Norwegian krull. Related also to Saterland Frisian Kruus, German kraus, Danish krus, Swedish krusa. Compare also Gothic 𐌺𐍂𐌹𐌿𐍃𐍄𐌰𐌽.

• (British) IPA: /kɜːl/, [kʰəːɫ]
• (America) IPA: /kɜɹl/, [kʰɝɫ]

curl (plural curls)

1. A curving piece or lock of hair; a ringlet.
   • 1866, Louisa May Alcott, chapter 7, in Behind A Mask or, A Woman's Power:

     […] she took it down, looked long and fondly at it, then, shaking her curls about her face, as if to hide the act, pressed it to her lips and seemed to weep over it in an uncontrollable paroxysm of tender grief.

   • 1963, Margery Allingham, chapter 17, in The China Governess: A Mystery, London: Chatto & Windus, →OCLC ↗:

     The face which emerged was not reassuring. […]. He was not a mongol but there was a deficiency of a sort there, and it was not made more pretty by a latter-day hair cut which involved eccentrically long elf-locks and oiled black curls.

2. A curved stroke or shape.
   • 1995, John Curtis, Julian Reade, Dominique Collon, Art and Empire: Treasures from Assyria in the British Museum, page 184:

     […] the backs of their necks and their forelegs are decorated with curls and their necks and bodies are covered with fine, undulating lines.

3. A spin making the trajectory of an object curve.
4. (curling) Movement of a moving rock away from a straight line.
5. (weightlifting) Any exercise performed by bending the arm, wrist, or leg on the exertion against resistance, especially those that train the biceps.
   • 2007 (Jan/Feb), Jon Crosby, "Your Winter Muscle Makeover", Men's Health, page 54:

     Now do a curl and an overhead press, keeping your palms facing in.

6. (calculus) The vector field denoting the rotationality of a given vector field.
   • 1995, Erich Prisner, Graph dynamics:

     In 2D, when Q is a polygonal domain, the singularities of Type (2) disappear because ψ is the scalar curl of u and is such that its vectorial curl is zero.

   The curl of the vector field \vec{F}(x,y,z) is the vector field \operatorname{curl}\,\vec{F} \equiv \vec{\nabla}\times\vec{F}=\left( \frac{\partial F_z}{\partial y} - \frac{\partial F_y}{\partial z}, \frac{\partial F_x}{\partial z} - \frac{\partial F_z}{\partial x}, \frac{\partial F_y}{\partial x} - \frac{\partial F_x}{\partial y} \right).

7. (calculus, proper noun) The vector operator, denoted \rm{curl}\; or \vec{\nabla}\times\vec{\left(\cdot\right)}, that generates this field.
8. (agriculture, phytopathology) Any of various diseases of plants causing the leaves or shoots to curl up; often specifically the potato curl.
   • 1840, "Farmers' Department", The Family Magazine‎, volume 1, page 227:

     These potatoes, however, planted the next year, have a fair yield, untouched by the curl.

9. (music, chiefly, lutherie) The contrasting light and dark figure seen in wood used for stringed instrument making; the flame.

   The one-piece back is of a medium curl.

10. (American football) A pattern where the receiver appears to be running a fly pattern but after a set number of steps or yards quickly stops and turns around, looking for a pass.
11. (baking, chiefly, in the plural) A thin, curved piece of chocolate used as decoration.

• (curving lock of hair) ringlet
• (curved stroke or shape) curlicue, curve, flourish, loop, spiral

• (antonym(s) of “weightlifting exercise”): extension

• French: boucle
• German: Locke
• Italian: riccio, ricciolo, boccolo
• Portuguese: cacho, caracol
• Russian: ло́кон
• Spanish: rizo, bucle

• Italian: arricciamento
• Russian: завито́к

• Italian: rotazione, spirale

• Italian: voluta

• Spanish: flexión

• French: rotationnel
• Italian: rotazione

• French: rotationnel
• Portuguese: rotacional
• Russian: ро́тор

• Italian: arricciamento, accartocciamento

curl (curls, present participle curling; simple past and past participle curled)

1. (transitive) To cause to move in a curve.
   • 1998, Nick Hornby, Fever Pitch, page 70:

     He picked the ball up about forty yards out on the left wing, left a trail of Arsenal defenders in his wake, and curled the ball round Geoff Barnett as he came right out into the far corner.

2. (transitive) To make into a curl or spiral.
   • 2004, Jacquelyn Mitchard, Twelve Times Blessed, page 249:

     She curls her spine; she wedges a pillow between her knees.

3. (intransitive) To assume the shape of a curl or spiral.
   • 1847, Charlotte Brontë, chapter XXXI, in Jane Eyre:

     It seemed to me that Mr. St. John's under lip protruded, and his upper lip curled a moment.

4. (intransitive) To move in curves.
   • 1977, Scott O'Dell, Carlota, page 1:

     Clouds curled down from the mountains.

   • 2007, John Coyne, The Caddie Who Knew Ben Hogan, page 97:

     The ball curled to a stop within six inches of the hole.

5. (intransitive, curling) To take part in the sport of curling.

   I curl at my local club every weekend.

6. (transitive, weightlifting) To exercise by bending the arm, wrist, or leg on the exertion against resistance, especially of the biceps.
   • 2008, Joseph Lee Klapper, The Complete Idiot's Guide to Boosting Your Metabolism, page 119:

     When curling the weight, bring the barbell up toward the chin, then return it to its starting position. Keep your elbows and upper arms as immobile as possible to isolate the biceps.

7. To twist or form (the hair, etc.) into ringlets.
   • 1977, Agatha Christie, chapter 4, in An Autobiography, part II, London: Collins, →ISBN:

     There was also hairdressing: hairdressing, too, really was hairdressing in those times — no running a comb through it and that was that. It was curled, frizzed, waved, put in curlers overnight, waved with hot tongs; […].

8. To deck with, or as if with, curls; to ornament.
   • 1667, John Milton, “Book VII”, in Paradise Lost. […], London: […] [Samuel Simmons], and are to be sold by Peter Parker […]; [a]nd by Robert Boulter […]; [a]nd Matthias Walker, […], →OCLC ↗; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873, →OCLC ↗:

     Thicker than the snakie locks / That curld Megæra.

9. To raise in waves or undulations; to ripple.
   • 1700, [John] Dryden, “The Flower and the Leaf: Or, The Lady in the Arbour. A Vision.”, in Fables Ancient and Modern; […], London: […] Jacob Tonson, […], →OCLC ↗:

     Seas would be pools without the brushing air / To curl the waves.

10. (hat-making) To shape (the brim of a hat) into a curve.

• (to make into a curl or spiral) arch, coil, roll up
• (to assume the shape of a curl or spiral) coil, roll up
• (to move in curves) curve, spiral

• (antonym(s) of “to make into a curl or spiral”): straighten, uncoil, unroll
• (antonym(s) of “to assume the shape of a curl or spiral”): straighten, uncoil, unroll

• Russian: вить

• Portuguese: encaracolar

• Russian: ви́ться

• As an English surname, from the noun curl.
• As a German - surname, variant of Kerl.

1. Surname.