1bet 
/ˈbɛt/ noun
plural bets /ˈbɛt/ noun 1 [count] : an agreement in which people try to guess what will happen and the person who guesses wrong has to give something (such as money) to the person who guesses right
▪ He has a bet on the game. ▪ “I'll bet five dollars that my team will beat your team.” “Okay. It's a bet!” [=I agree to the bet] ▪ He made a bet with his brother that he could finish his chores first. ▪ He and his brother have a bet about who can finish his chores first. ▪ He lost the bet and had to pay his brother five dollars. ▪ His brother won the bet. ▪ He paid his brother five dollars to settle the bet. 2 [count] : the money or other valuable thing that you could win or lose in a bet
▪ What's your bet? [=how much money do you want to risk?] ▪ She placed/laid a $10 bet [=wager] on the number five horse. 3 [singular] : a choice made by thinking about what will probably happen
▪ It's a good/safe/sure bet that they'll win. [=it is very likely that they will win] ▪ I don't know what their decision will be, but my bet is that they'll approve the project. [=I think they'll approve the project] ▪ If you want to get there early, your best/surest/safest bet is to take a different road. [=you are most likely to get there early if you take a different road]
▪ He has a bet on the game. ▪ “I'll bet five dollars that my team will beat your team.” “Okay. It's a bet!” [=I agree to the bet] ▪ He made a bet with his brother that he could finish his chores first. ▪ He and his brother have a bet about who can finish his chores first. ▪ He lost the bet and had to pay his brother five dollars. ▪ His brother won the bet. ▪ He paid his brother five dollars to settle the bet.
▪ What's your bet? [=how much money do you want to risk?] ▪ She placed/laid a $10 bet [=wager] on the number five horse.
▪ It's a good/safe/sure bet that they'll win. [=it is very likely that they will win] ▪ I don't know what their decision will be, but my bet is that they'll approve the project. [=I think they'll approve the project] ▪ If you want to get there early, your best/surest/safest bet is to take a different road. [=you are most likely to get there early if you take a different road]
all bets are off
— used to describe a situation in which it is impossible to be sure about what will happen ▪ All bets are off on the election: it's too close to call.
hedge your bets — see 2hedge
