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tip sb off

phrasal verb with tip
 
 
/tɪp/ verb (-pp-)

Definition

C2 to warn someone secretly about something that will happen, so that they can take action or prevent it from happening: [+ that] Somebody must have tipped the burglars off that the house would be empty. The robber was caught when someone tipped off the police.Threats and warningsRevealing secrets and becoming known
(Definition of tip sb off from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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