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tap

verb [T] (PHONE)
 
 
/tæp/ (-pp-)

Definition

to use a small device fixed to a phone in order to listen secretly to what people are saying: He suspected that his phone had been tapped.Amplifiers, microphones and speakersSpying and espionage
(Definition of tap verb (PHONE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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