an attempt to give an answer or an opinion when you cannot be certain if you are right guess (at something) to take/make a guess Go on! Take a guess! guess (about something) The article is based on guesses about what might happen in the future. They might be here by 3—but that's just a rough guess (= not exact). guess (that…) My guess is that we won't hear from him again. If I might hazard a guess, I'd say she was about thirty. Who do you think I saw yesterday? I'll give you three guesses.
Idioms something that no one can be certain about What will happen next is anybody's guess. a guess that is based on some degree of knowledge, and is therefore likely to be correct used to tell someone that you do not know any more about a subject than the person that you are talking to does “Who's going to win?” “Your guess is as good as mine.” to make a mistake Unless I miss my guess, your computer needs a new hard drive. If you miss your guess, you lose 10 points. See guess in the Oxford Advanced Learner's DictionaryCheck pronunciation:
guess