Longman Dictionary of Contemporary English homepage

guess

2 noun
     
guess2 S2 [countable]
1 an attempt to answer a question or make a judgement when you are not sure whether you will be correctCOLLOCATIONS COLLOCATIONS
make a guess (at something) have a guess (at something) British English take a guess (at something) American English hazard a guess (=guess something, when you feel very uncertain) give somebody three guesses (=allow someone to guess three times) lucky guess good guess best guess educated/informed guess (=one that is likely to be correct because you have enough information) rough guess (=one that is not exact) wild guess (=one made without much thought) my guess is (that) at a guess (=used to show that what you are saying is just a guess)
If I had to make a guess, I'd say Sam was the youngest.
Does anyone want to take a guess at what all this has to do with grammar?
I can only hazard a guess at what it must have been like.
I'll give you three guesses who I'm going out with tonight.
It had been a lucky guess, that was all.
It's a good guess, but wrong nonetheless.
Our best guess is that the forests will not recover for a long time.
People started making educated guesses about the outcome of the election.
I'd say she's about 35, but that's only a rough guess.
My guess is that there won't be many people there today.
At a guess, she'd had an argument with her boyfriend.
 ➔ see usage note suppose
2

be anybody's guess

to be something that no one knows:
What she's going to do with her life now is anybody's guess.
3

your guess is as good as mine

spoken used to tell someone that you do not know any more than they do about something
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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