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Pronunciation of sure /ʃɔ/ (say shaw)

adjective (surer, surest)
1. (sometimes followed by of) free from apprehension or doubt as to the reliability, character, action, etc., of something: to be sure of one's data.

2.  confident, as of something expected: sure of ultimate success.

3.  convinced, fully persuaded, or positive, as of something firmly believed: sure of a person's guilt.

4.  assured or certain beyond question: we are all sure of death.

5.  worthy of confidence; reliable: a sure messenger.

6.  firm or stable: to stand on sure ground.

7.  unfailing; never disappointing expectations: a sure cure.

8.  unerring; never missing, slipping, etc.: a sure aim.

9.  admitting of no doubt or question: sure proof.

10.  inevitable: death is sure.

11.  destined; bound inevitably; certain: he is sure to come.

12. Obsolete secure or safe.

adverb 13. Colloquial surely, undoubtedly, or certainly.

14. US Colloquial inevitably or without fail.

interjection 15.  (sometimes ironic) certainly.

phrase 16. (as) sure as eggs (are eggs), Colloquial
a.  very confident: I'm as sure as eggs.
b.  very definite: it's as sure as eggs.

17. as sure as hell, Colloquial quite definitely.

18. a sure thing, Colloquial a certainty; something assured beyond any doubt.

19. be sure, be certain or careful (to do as specified): be sure to close the windows; you must be sure and visit us.

20. be sure of, to be confident in the support or possession of.

21. for sure, as a certainty; surely.

22. make sure, to ensure (that something happens).

23. make sure of, to secure the support or possession of.

24. sure as death and taxes, Colloquial definitely going to happen.

25. sure thing, Colloquial (an expression of assurance.)

26. to be sure, surely; certainly; without doubt.

[Middle English, from Old French, from Latin sēcūrus secure]
sureness, noun