tip-off

Từ điển Oxford Advanced Learner 8th

ˈtip-off [tip-off tip-offs] BrE NAmE noun (especially BrE) (NAmE usually tip) (informal)
secret information that sb gives, for example to the police, to warn them about an illegal activity that is going to happen
•The man was arrested after an anonymous tip-off.
See also: ↑tip

Example Bank:
•Customs officers had received a tip-off about a shipment of cocaine.
•He was arrested after a tip-off to police.