Phrasal verb guess at something (Definition of guessing from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Guessing is the act of drawing a swift conclusion, called a guess, from data directly at hand, which is then held as probable or tentative, while the person making the guess (the guesser) …

To assume, presume, or assert (a fact) without sufficient information. 2. To form a correct estimate or conjecture of: guessed the answer. 3. To suppose; think: I guess he was wrong. 1. …

The meaning of GUESS is to form an opinion of from little or no evidence. How to use guess in a sentence.

Something that is anybody's/anyone's guess is something that is very uncertain or that no one knows. It's anyone's guess what his next book will be about.

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To guess is to risk an opinion regarding something one does not know about, or, wholly or partly by chance, to arrive at the correct answer to a question: to guess the outcome of a game. …