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to have one's number
01
to have the advantage by being fully aware of someone's real motives or character
![to [have] {one's} number definition and meaning](https://cdn.langeek.co/photo/44782/original/?type=jpeg "to [have] {one's} number definition and meaning")
Idiom
InformalWhat is the origin of the idiom "have one's number" and when to use it?
The origin of the idiom "have one's number" is derived from the idea that everyone has a unique telephone number. In the context of this phrase, it means having someone figured out or knowing their true nature or intentions. This expression is used to convey that someone understands another person very well, often implying that they can predict their behavior or motives.
Example
She thinks she can fool me, but I have her number, and I know what she's up to.
John may act friendly, but I've had his number for years; he's always looking out for himself.
Do n't you dare, even for one second, think that you're safe from me.
