Oxford Dictionary English

tip-off

noun
noun
BrE BrE//ˈtɪp ɒf//
; NAmE NAmE//ˈtɪp ɔːf//
, NAmE//ˈtɪp ɑːf//
(especially British English) (usually North American English tip) (informal) Solving crime, Terrorism
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secret information that somebody 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. Customs officers had received a tip-off about a shipment of cocaine. He was arrested after a tip-off to police. See related entries: Solving crime, Terrorism
See tip-off in the Oxford Advanced American Dictionary
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