American English

Definition of bet verb from the Oxford Advanced American Dictionary

      

    bet

     verb
    verb
    NAmE//bɛt//
     
    Verb Forms present simple I / you / we / they bet
     
    he / she / it bets
     
    past simple bet
     
    -ing form betting
     
     
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  1. 1 [intransitive, transitive] to risk money on a race or an event by trying to predict the result You have to be over 18 to bet. bet on/against something I wouldn't bet on them winning the next election. bet something (on something) He bet $2,000 on the final score of the game. bet (somebody) (something) (that…) She bet me $20 that I wouldn't do it. see also betting, gamble
  2. 2 [transitive] (informal) used to say that you are almost certain that something is true or that something will happen bet (that)… I bet (that) we're too late. You can bet (that) the minute I sit down, the phone will ring. bet somebody (that)… I'll bet you (that) he knows all about it.
  3. Idioms
      I/I'll bet! (informal)
       
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    1. 1 used to show that you can understand what someone is feeling, describing, etc. “I almost died when he told me.” “I bet!”
    2. 2used to tell someone that you do not believe what they have just said “I'm going to tell her what I think of her.” “Yeah, I bet!”
    I wouldn't bet on it, don't bet on it (informal)
     
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    used to say that you do not think that something is very likely “She'll get used to the idea.” “I wouldn't bet on it.”
    want to bet? (also wanna bet?) (informal)
     
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    used to disagree with what someone has stated or claimed “The Giants are going to win the Super Bowl.” “Want to bet?”
    you bet! (informal)
     
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    used instead of “yes” to emphasize that someone has guessed something correctly or made a good suggestion “Are you nervous?” “You bet!”
    you can bet your life/your bottom dollar (on something/(that)…) (informal)
     
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    used to say that you are certain that something will happen You can bet your bottom dollar that he'll be late.
See the Oxford Advanced Learner's Dictionary entry: bet