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English definition of “sure”

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sure

adjective
 
 
/ʃɔːr/
A2 [never before noun] certain: [+ (that)] I'm sure that he won't mind. [+ question word] She's not sure what she's going to do next. I'm quite sure about the second answer. →  Opposite unsure CertaintyConfidence and self-assurance
make sure (that) A2 to take action so that you are certain that something happens, is true, etc: Make sure that you close all the windows before you leave.CertaintyConfidence and self-assurance
be sure of sth B2 to be confident that something is true: He'll win, I'm sure of it.CertaintyConfidence and self-assurance
for sure B1 without any doubts: I think he's from Korea but don't know for sure.CertaintyConfidence and self-assurance
be sure of yourself B2 to be confident of your own abilities, qualities, etc: She's always been very sure of herself.Confidence and self-assuranceShowing arrogance and conceit
be sure to do sth If you are sure to do something, it is certain that you will do it: He's sure to go back there again.CertaintyConfidence and self-assurance used to tell someone what they must remember to do: Be sure to tell her I called.Remembering, reminding and reminders
a sure sign of/that sth something that makes something seem certain to be trueCertaintyConfidence and self-assurance
a sure thing something that is certain to happen: Death is the one sure thing about life.CertaintyConfidence and self-assurance
sure ( also US sure thing) A2 used to show agreement: "Can I borrow your pen please?" "Sure."Yes, no and not
sure enough B2 as expected: He said the book was on his desk, and sure enough, there it was.Connecting words joining words or phrases with similar or related meanings
(Definition of sure from the Cambridge Learners Dictionary © Cambridge University Press)
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