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English definition of “guess”

guess

verb [I or T] uk   /ɡes/ us  
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. 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?" guess what? A2 informal used before telling someone something interesting or surprising: Guess what? We won the match 4–0. 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.
Phrasal verbs

guess

noun [C] uk   /ɡes/ us  
B1 an attempt to give the right answer when you are not certain if you are correct: Go on - have/make (US take) a guess. Both teams made some wild guesses (= made without much thought), none of which were right. "What's the time?" "It's about five o'clock, at a guess (= without knowing exactly)." someone's opinion about something that is formed without any knowledge of the situation: "I wonder why she's not here." "My guess is that her car has broken down." be anyone's guess If a piece of information is anyone's guess, no one knows it: "So what's going to happen now?" "That's anyone's guess."
(Definition of guess from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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