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English definition of “tip sb off”

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tip sb off

verb uk phrasal verb with tip   /tɪp/ (-pp-) us  
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.
(Definition of tip sb off from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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