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English definition of “guess”

guess

verb [I or T]     /ɡes/
A2 to give an answer to a particular question when you do not have all the facts and so cannot be certain if you are correct: I didn't know the answer, so I had to guess. On the last question, she guessed right/wrong. [+ question word] Guess when this was built. [+ (that)] I guessed (that) she was your sister. She asked me to guess her age. I guessed the total amount to be about £50,000.Guessing, supposing and suspecting A2 to give the correct answer or make the correct judgment: [+ question word] I bet you can't guess how old he is. She guessed the answer first time. "You've got a new job, haven't you?" "Yes, how did you guess?"Imagining and conceiving guess what? A2 informal used before telling someone something interesting or surprising: Guess what? We won the match 4–0.InterjectionsSounds used as interjections I guess B1 informal used when you believe something is true or likely but are not certain: [+ (that)] I guess (that) things are pretty hard for you now.Imagining and conceiving
(Definition of guess verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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