have someone's number
US /hæv ˈsʌm.wʌnz ˈnʌm.bər/
UK /hæv ˈsʌm.wʌnz ˈnʌm.bər/

1.
tahu sifat asli seseorang, tahu kelemahan seseorang
to know someone's true character or intentions, especially their weaknesses or secrets
:
•
I think I have his number; he's all talk and no action.
Saya rasa saya sudah tahu sifat aslinya; dia hanya banyak bicara tapi tidak bertindak.
•
The detective quickly had the suspect's number and knew he was lying.
Detektif itu dengan cepat mengetahui sifat asli tersangka dan tahu dia berbohong.