If you bet on the result of a horse race, football game, or other event, you give someone a sum of money which they give you back with extra money if the result is what you predicted, or which they keep if it is not.

A bet is a sum of money which you give to someone when you bet.

If someone is betting that something will happen, they are hoping or expecting that it will happen.

You use expressions such as 'I bet', 'I'll bet', and 'you can bet' to indicate that you are sure something is true.

If you tell someone that something is a good bet, you are suggesting that it is the thing or course of action that they should choose.

If you say that it is a good bet or a safe bet that something is true or will happen, you are saying that it is extremely likely to be true or to happen.

If you hedge your bets, you follow two courses of action to avoid making a decision between two things because you cannot decide which one is right.

You use I bet or I'll bet in reply to a statement to show that you agree with it or that you expected it to be true, usually when you are annoyed or amused by it.

You can use my bet is or it's my bet to give your personal opinion about something, when you are fairly sure that you are right.

If you say don't bet on something or I wouldn't bet on something, you mean that you do not think that something is true or will happen.

If you reply 'Do you want to bet?' or 'Want a bet?' to someone, you mean you are certain that what they have said is wrong.

You use 'You bet' or 'you bet your life' to say yes in an emphatic way or to emphasize a reply or statement.