BET

noun

1. A wager, an agreement between two parties that a stake (usually money) will be paid by the loser to the winner (the winner being the one who correctly forecast the outcome of an event).
2. A degree of certainty.

verb

1. To stake or pledge upon the outcome of an event; to wager.
2. To be sure of something; to be able to count on something.
3. To place money into the pot in order to require others do the same, usually only used for the first person to place money in the pot on each round.

interjection

1. Expression of general agreement or acceptance.
2. Exclamation indicating acceptance of a challenge or an absurd proposal.
3. Exclamation of joy at good fortune.