From WordNet (r) 3.0 (2006):
bet
n 1: the money risked on a gamble [syn: stake, stakes,
bet, wager]
2: the act of gambling; "he did it on a bet" [syn: bet,
wager]
v 1: maintain with or as if with a bet; "I bet she will be
there!" [syn: bet, wager]
2: stake on the outcome of an issue; "I bet $100 on that new
horse"; "She played all her money on the dark horse" [syn:
bet, wager, play]
3: have faith or confidence in; "you can count on me to help you
any time"; "Look to your friends for support"; "You can bet
on that!"; "Depend on your family in times of crisis" [syn:
count, bet, depend, look, calculate, reckon]