Definition of bet noun from the Oxford Advanced Learner's Dictionary

      

    bet

     noun
    noun
    BrE BrE//bet//
     
    ; NAmE NAmE//bet//
     
     
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  1. 1  an arrangement to risk money, etc. on the result of a particular event; the money that you risk in this way to win/lose a bet bet on something We've got a bet on who's going to arrive first. He had a bet on the horses. They all put a bet on the race. I hear you're taking bets on whether she'll marry him. I did it for a bet (= because somebody had agreed to pay me money if I did). ‘Liverpool are bound to win.’ ‘Do you want a bet?(= I disagree with you, I don't think they will.)
  2. 2(informal) an opinion about what is likely to happen or to have happened My bet is that they've been held up in traffic.
  3. Word Origin late 16th cent.: perhaps a shortening of the obsolete noun abet ‘abetment’.Extra examples I made a bet with a friend. I was tempted to place a large bet. I wish I hadn’t agreed to that stupid bet. I’m going to place a bet on that white horse. My bet is that Canada will win. We are now taking bets on the election result. ‘Liverpool are bound to win.’ ‘Do you want a bet?’ I did it for a bet. I hear you’re taking bets on whether she’ll marry him. to win/​lose a betIdioms used to say that if a particular event happens then your current forecast, agreement, etc. will no longer apply We expect shares to rise unless the economy slows down again, in which case all bets are off. (informal) used to tell somebody what is the best action for them to take to get the result they want If you want to get around London fast, the Underground is your best bet. something that is likely to happen, to succeed or to be suitable Clothes are a safe bet as a present for a teenager. to reduce the risk of losing or making a mistake by supporting more than one side in a competition, an argument, etc., or by having several choices available to you She hedged her bets by applying for various other jobs as well.
See the Oxford Advanced American Dictionary entry: bet