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English definition of “bet”

bet

verb uk   /bet/ (present participle betting, past tense and past participle bet) us  
C1 [I or T] to risk money on the result of an event or a competition, such as a horse race, in the hope of winning more money: He regularly goes to the races and bets heavily. She bet £500,000 on the horse that came in second. [+ two objects, + (, that, )] I bet you $25 (that) I'll get there before you. B1 [T] informal If you say you bet (someone) that something is true or will happen, you mean you are certain that it is true or will happen: [+ (that)] I bet you (that) she's missed the bus. I bet (that) he won't come.

bet

noun [C] uk   /bet/ us  
C2 an amount of money that you risk on the result of an event or a competition, such as a horse race: He placed/put a bet on the grey horse. informal a guess or opinion: [+ (that)] My bet is (that) their baby will be a girl.
(Definition of bet from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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