tip-off
noun (especially British English)(North American English usually tip)
(informal)secret information that somebody gives, for example to the police, to warn them about an illegal activity that is going to happen or has happened 举报；密告；线报 The man was arrested after an anonymous tip-off. 有人匿名举报后，那个人被抓了起来。 Customs officers had received a tip-off about a shipment of cocaine. 海关关员接获了关于一批可卡因的密报。 He was arrested after a tip-off to police. 警方接获密报之后逮捕了他。