n. 1. An agreement usually between two parties that the one who has made an incorrect prediction about an uncertain outcome will forfeit something stipulated to the other; a wager: made a bet that it would stop raining before 2. An amount or object risked in a wager; a stake: a bet of $ you bet. Meaning. for sure; most certainly; without any doubt; to agree completely; to express agreement; yes, of course; Example Sentences. The manager will pull this deal off. You bet on something else about him because this is definitely happening. You bet that you will cross the finish line first. It isn't happening with me participating in this race. you bet definition: 1. used to emphasize a statement or to mean "certainly": 2. used when someone thanks you: 3. Learn more. “You bet,” a regional phenomenon much like “ehyup,” means “yes” in some parts of New England, “you betcha” for an affirmative or “you’re welcome” in North and South Dakota. “Mm-hmm” is another casual or impersonal response when the more formal “you’re welcome” isn’t needed. “You bet” is an informal way of agreeing with someone, much like a casual nod. 2. Inf. You're welcome. Tom: Thank you. Jane: You bet. Sally: I appreciate it. Mary: You bet. McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © by The McGraw-Hill Companies, Inc. See also. Define you bet. you bet synonyms, you bet pronunciation, you bet translation, English dictionary definition of you bet. n. 1. An agreement usually between two parties that the one who has made an incorrect prediction about an uncertain outcome will forfeit something. You're welcome (informal, Upper Midwest) means "You can bet money on that", showing that you are percent agree with what another one has just said, and you think what he/she had said is true. you betcha You can be sure; absolutely. ("Betcha" is a colloquial contraction of "bet you," even though it is used redundantly after "you.") A: "Hey Frank, do you want to come with us to the movies?" B: "You betcha I do!" A: "Is it OK if Frank brings his girlfriend?" B: "You betcha! Tommy's bringing Sarah as well, so it's no problem at all." See also.