Definition from macmillandictionary.com
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Have a guess and then check it on your calculator.
Take a guess at what’s behind this screen.
a guess as to the number of people who might come
At a rough guess, I’d say there were twenty people in the room.
OK, I’ll make a wild guess, but I really don’t know.
The researchers made several inspired guesses about how the brain works.
I could probably make an educated guess.
We can only hazard a guess at what happened.