A bet made for the purpose of entrapping the unwary by subterfuge.

(UK, informal) How much do you want to bet that …?

(colloquial) Alternative form of want to bet

Are you sure? Do you really think so? (as a skeptical rebuttal to a claim)

(gambling) A wager having a very poor expected return relative to the odds of winning.

(gambling) To lay bets of equal value against nearly all the horses in a race, so as to stand no great risk of losing.

Alternative form of bet a dollar to a doughnut

(idiomatic) To be absolutely sure of something; to be certain enough to wager an essential possession.

Synonym of bet a dollar to a doughnut

Alternative form of bet a dollar to a dime