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tip-off

noun [C usually singular]
 
 
/ˈtɪp.ɒf/ US  /-ɑːf/ informal

Definition

a secret warning or piece of secret information: Acting on a tip-off, the police arrested the drug dealers. Following a tip-off from a friend, we sold all our shares in the company.Information and messagesThreats and warnings
(Definition of tip-off noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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