When you don't know the answer but you have to say something, you're taking a guess.

When you don't know the answer on a test, you have to guess. People on game shows guess when they're not sure. There are wild guesses (when you have no idea) and educated guesses (when you have some information to work with). Trying to guess someone's age or weight is usually a bad idea, especially if you guess too old or heavy. If the teacher doesn't show up, you could say, "I guess there's no class today.”

Definitions of guess

v expect, believe, or suppose

“I guess she is angry at me for standing her up”
imagine, opine, reckon, suppose, think
hold in suspicion; believe to be guilty
Type of:
anticipate, expect
regard something as probable or likely

v put forward, of a guess, in spite of possible refutation

“I am guessing that the price of real estate will rise again”
hazard, pretend, venture
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anticipate, call, forebode, foretell, predict, prognosticate, promise
make a prediction about; tell in advance
surmise, suspect
imagine to be the case or true or probable
interpret the significance of, as of palms, tea leaves, intestines, the sky; also of human behavior
outguess, second-guess
attempt to anticipate or predict
predict from an omen
bet, wager
maintain with or as if with a bet
calculate, forecast
predict in advance
prophesy, vaticinate
predict or reveal through, or as if through, divine inspiration
Type of:
talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion

v judge tentatively or form an estimate of (quantities or time)

approximate, estimate, gauge, judge
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quantise, quantize
approximate (a signal varying continuously in amplitude) by one whose amplitude is restricted to a prescribed set of discrete values
gauge something incorrectly or improperly
place, put, set
estimate the duration or outcome of something
lowball, underestimate
make a deliberately low estimate
estimate the value of (property) for taxation
calculate as being
count, reckon
take account of
approximate by ignoring all terms beyond a chosen one
estimate based on a calculation
Type of:
calculate, cipher, compute, cypher, figure, reckon, work out
make a mathematical calculation or computation

v guess correctly; solve by guessing

“He guessed the right number of beans in the jar and won the prize”
discern or comprehend
Type of:
figure out, lick, puzzle out, solve, work, work out
find the solution to (a problem or question) or understand the meaning of

n an estimate based on little or no information

dead reckoning, guessing, guesswork, shot
Type of:
approximation, estimate, estimation, idea
an approximate calculation of quantity or degree or worth

n a message expressing an opinion based on incomplete evidence

conjecture, hypothesis, speculation, supposition, surmisal, surmise
successful conjecture by unusual insight or good luck
Type of:
opinion, view
a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof

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