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Phrase(s): gamble on someone or something
1. Lit. to make a wager on something concerning someone or something. • I wouldn’t gamble on it happening. • Don’t gamble on that horse. You’ll be sorry. 2. Fig. to run a risk by choosing or depending on someone or something. • I wouldn’t gamble on Ted’s being able to come. I don’t think he can. • Don’t gamble on Ted. I’m almost sure he won’t come.
McGrawhill's American Idioms And Phrasal Verbs