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English definition of “tap”

tap

verb [T] (PHONE)    /tæp/ (-pp-)
to use a small device attached 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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