n. 25B6; verb
he bet £10 on the favourite : WAGER, gamble, stake, risk, venture, hazard, chance; put/lay money, speculate; informal punt; Brit. informal have a flutter, chance one's arm.
(informal) I bet it was your idea : BE CERTAIN, be sure, be convinced, be confident; expect, predict, forecast, guess; Brit. informal put one's shirt on.
25B6; noun
a £20 bet : WAGER, gamble, stake, ante; Brit. informal flutter, punt.
(informal) my bet is that they'll lose : PREDICTION, forecast, guess; opinion, belief, feeling, view, theory.
(informal) your best bet is to go early : OPTION, choice, alternative, course of action, plan.