have the law on somebody

have the law on (someone)

To inform the police of someone's activities. Primarily heard in UK. I'll have the law on you if I catch you on my property again!
See also: have, law, on

have the ˈlaw on somebody

(British English, informal) (often used as a threat) report somebody to the police: If you have just one more noisy party, I’ll have the law on you.
See also: have, law, on, somebody