Definition of have someone's number in English:

have someone's number

informal Understand a person’s real motives or character and thereby gain some advantage.
More example sentences
  • If the cops have your number, you will be screwed no matter how law-abiding you are.
  • Yep, there are plenty do-gooders are out there and they have your number, baby, trust me.
  • They can't easily strike in the Middle East precisely because Syria, Egypt, Algeria, etc. have their number and have undertaken massive actions against them.
See parent entry: number

Definition of have someone's number in:

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Word of the day iconoclasm
Pronunciation: ʌɪˈkɒnəklaz(ə)m
noun
attacking or rejecting cherished beliefs or established values...