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English definition of “tap”

tap

verb     /tæp/ (present participle tapping, past tense and past participle tapped)
KNOCK [I, T] B2 to knock or touch something gently : She tapped her fingers nervously on the table . I tapped on the window to try and get her attention .Touching and feelingShowing affectionSounds made by objects, movement or impact
A SUPPLY [T] If you tap a supply of something, you use what is available : There are immense natural resources here waiting to be tapped.Using and misusing
TELEPHONE [T] to use a special piece of equipment to listen to someone's telephone calls : [often passive] I think the phone's been tapped.Amplifiers, microphones and speakersSpying and espionageCommunicating by telephone
(Definition of tap verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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