have number


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have (got) somebody's number

to understand the way someone behaves They've got our number – they play harder against us than anybody else. She seems to know exactly what people our age want – she definitely has our number.
See also: have, number

have somebody's number

  (informal)
to know that someone is trying to do something bad and therefore be able to deal with them I'm not worried about Taylor. I've got his number and I know what to expect.
See also: have, number