• (RP) IPA: /ʃʊə/, /ʃɔː/
• (Aus, New Zealand) IPA: /ʃoː/
• (America) IPA: /ʃʊəɹ/, /ʃɔɹ/, /ʃɝ/
• (Canada) IPA: /ʃɔɹ/, /ʃɝ/
• (obsolete) IPA: /sjʊəɹ/, /sjuːɹ/, /sɪʊ̯ɹ/

sure (comparative surer, superlative surest)

1. Physically secure and certain, non-failing, reliable.

   This investment is a sure thing.   The bailiff had a sure grip on the prisoner's arm.

2. Certain in one's knowledge or belief.

   He was sure she was lying.   I am sure of my eventual death.   John was acting sure of himself but in truth had doubts.

3. Certain to act or be a specified way.

   Be sure to lock the door when you leave.

4. (obsolete) Free from danger; safe; secure.
   • c. 1590–1591, William Shakespeare, “The Two Gentlemen of Verona”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act V, scene i]:

     Fear not; the forest is not three leagues off; / If we recover that we are sure enough.

5. (obsolete) Betrothed; engaged to marry.

   • The king was sure to Dame Elizabeth Lucy, and her husband before God.

   • I presume […] that you had been sure as fast as faith could bind you, man and wife.

• (secure and steadfast) certain, failsafe, reliable, sicker
• (steadfast in one's knowledge or belief) certain, positive, wis

• French: sûr, sûre, certain
• German: sicher, stichhaltig, hieb- und stichfest, wasserdicht
• Italian: sicuro, sicura, certo, certa
• Portuguese: certo, seguro
• Russian: уве́ренный
• Spanish: seguro

• French: sûr, certain
• German: sicher
• Portuguese: certo
• Russian: уве́ренный
• Spanish: seguro

sure

1. (modal adverb) Without doubt, certainly.

   Sure he's coming! Why wouldn't he?

   "Did you kill that bear yourself?" ―"I sure did!"

   • These high and gusty relishes of life, sure,
     Have no allayings of mortality in them.

1. Yes. (Expresses noncommittal agreement or consent.)

   "Do you want me to put this in the garage?" "Sure, go ahead."

2. Yes; of course.

   "Could you tell me where the washrooms are?" "Sure, they're in the corner over there."

• (noncommittal yes) OK, yes

• French: d'accord

• French: bien sûr
• German: sicher
• Italian: certo
• Portuguese: tá, claro, tudo bem
• Russian: коне́чно
• Spanish: por supuesto, claro