The Collaborative International Dictionary of English v.0.48:
Yap \Yap\, v. i. [Icel. gj[=a]lpa; akin to yelp. Cf. Yaup.] To bark; to yelp. --L'Estrange. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Yap \Yap\, n. A bark; a yelp. [1913 Webster]WordNet (r) 3.0 (2006):
yap n 1: informal terms for the mouth [syn: trap, cakehole, hole, maw, yap, gob] v 1: bark in a high-pitched tone; "the puppies yelped" [syn: yelp, yip, yap]