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.
Read more about this topic: Flap Consonant
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