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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

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