flapping

Short definition from Wiktionary

Adjective

1. 1
   that flaps or flap

Noun

1. 1
   An instance where one flaps.
2. 2
   A phonological process found in many dialects of English, especially American English and Canadian English, by which intervocalic /t/ and /d/ surface as the alveolar flap [ɾ] before an unstressed syllable, so that words such as "metal" and "medal" are pronounced similarly or identically.
3. 3
   The situation where a resource, a network destination, etc., is advertised as being available and then unavailable (or available by different routes) in rapid succession.
4. 4
   The unlicensed racing of horses or greyhounds.

Verb

1. 1
   present participle and gerund of flap