Definition of tap noun from the Oxford Advanced American Dictionary

     

    tap

     noun
    noun
    NAmE//tæp//
     
     
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  1. 1 [countable] = faucet Turn the tap on/off. see also tap water
  2. 2[countable] a device for controlling the flow of liquid or gas from a pipe or container a gas tap beer taps
  3. 3 [countable] a light hit with your hand or fingers a tap at/on the door He felt a tap on his shoulder and turned around.
  4. 4[countable] an act of fitting a device to a telephone so that someone's telephone calls can be listened to secretly a phone tap
  5. 5[uncountable] = tap dance
  6. 6 [countable] (phonetics) a speech sound that is produced by striking the tongue quickly and lightly against the part of the mouth behind the upper front teeth. The/t/ in later in American English and the/r/ in very in some British accents are examples of taps. synonym flap
  7. 7taps [uncountable, plural] a tune played on a bugle at military funerals and at the end of the day in military camps
  8. Idioms
    1. 1available to be used at any time We have this sort of information on tap.
    2. 2beer that is on tap is in a barrel with a tap on it
    3. 3 (informal) something that is on tap is being discussed or prepared and will happen soon
See the Oxford Advanced Learner's Dictionary entry: tap