Definition from macmillandictionary.com
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a competition to guess the weight of the pig
It’s difficult even to guess at the figures.
He guessed her age as 14 or 15.
Would anyone like to guess what this object is?
She guessed that it was about midday from the position of the sun.
Scientists are really still guessing as to the true cause of ice ages.
Whoever guesses correctly will win two tickets to the show.
He had already guessed the answer.
Surely she would guess the truth.
He wondered whether she knew or guessed about Amy.
Tim guessed she was awake.
I expect you’ve guessed by now that I lost the fight.
She guessed from the noise that her brothers were home.
From his expression, it wasn’t hard to guess what had happened.