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English definition of “have sb's number”

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have sb's number

to know a lot about someone and so have an advantage over them: Don't worry, I've got his number, he doesn't fool me.
Translations of “have sb's number”
in Chinese (Traditional) 對(某人)心中有數, 摸透(某人)的底…
in Chinese (Simplified) 对(某人)心中有数, 摸透(某人)的底…
(Definition of have sb's number from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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