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Flap consonant
In phonetics, a flap or tap is a type of consonantal sound, which is produced with a single contraction of the muscles so that one articulator (such as the tongue) is thrown against another.
==Contrast with stops and trills==
The main difference between a flap and a stop is that in a flap there is no buildup of air pressure behind the place of articulation and consequently no release burst. Otherwise a flap is similar to a brief stop.
Flaps also contrast with trills, where the airstream causes the articulator to vibrate. Trills may be realized as a single contact, like a flap, but are variable, whereas a flap is limited to a single contact. When a trill is brief and made with a single contact it is sometimes erroneously described as an (allophonic) flap, but a true flap is an active articulation whereas a trill is a passive articulation. That is, for a tap or flap the tongue makes an active gesture to contact the target place of articulation, whereas with a trill the contact is due to the vibration caused by the airstream rather than any active movement.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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