Used in a sentence: I had no clue what her favorite color was so I guessed that it was red.
As a verb, guess is also used as a synonym for words like think, believe, and suppose—it can mean to feel that something might be possible, doable, or.
I'm trying to guess the height of this building; If you don't know the answer, just guess.
I guess I'll have to leave now.
I got the answer by guesswork.
Guess also means to believe or suppose.