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English definition of “tip off someone”

tip off someone

(-pp-)
verb [I/T] phrasal verb with tip  /tɪp/ us  
to give secret information to someone, or to give someone information without intending to: Apparently the mob leaders were tipped off that police were watching them. Moving strike aircraft within range could have tipped off the bad guys.
(Definition of tip off someone from the Cambridge Academic Content Dictionary © Cambridge University Press)
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