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bet on someone or something
to wager on someone or something. Are you really going to bet on that horse? I bet on Paul. He is the fastest runner.
bet something on someone or something
to wager something on someone or something. I bet one thousand dollars on that horse! Fred bet a few bucks on his favorite football team.
1. To place a bet of some amount on some event: I bet $5 on the first race of the evening. I'm not going to bet on the last race.
2. To place a bet of some amount on some participant in an event: We bet $200 on the home team, but they lost. Don't bet anything on me in this game; I'm not a very good player. Will you bet on any of the players?
3. To expect or feel sure that something will happen: You can bet on Chris being late to the meeting.