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yap (v.)

1660s, "bark as a (small) dog," earlier as a noun, "yapping dog" (c. 1600), probably of imitative origin. Compare verb yamph in same sense (1718). Originally in reference to dog sounds; meaning "to talk idle chatter" is first recorded 1886. Related: Yapped; yapping. As a noun, 1826 in reference to the sound; 1900, American English slang as "mouth."

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Definitions of yap from WordNet
1
yap (v.)
bark in a high-pitched tone;
Synonyms: yelp / yip
2
yap (n.)
informal terms for the mouth;
Synonyms: trap / cakehole / hole / maw / gob
From wordnet.princeton.edu