Etymology
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yak (n.)

"wild ox of central Asia," 1795, from Tibetan g-yag "male yak." Attested in French from 1791.

yak (v.)

"laugh," 1938, variant of yuck (2); "talk idly," 1950, variant of yack. Related: Yakked; yakking.

updated on April 17, 2014

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Definitions of yak from WordNet
1
yak (n.)
noisy talk;
Synonyms: yack / yakety-yak / chatter / cackle
yak (n.)
large long-haired wild ox of Tibet often domesticated;
Synonyms: Bos grunniens
2
yak (v.)
talk profusely;
she was yakking away about her grandchildren
Synonyms: gab
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.