There are 2 main definitions of yak in English:

yak1

Line breaks: yak

noun (plural same or yaks)

A large domesticated wild ox with shaggy hair, humped shoulders, and large horns, used in Tibet as a pack animal and for its milk, meat, and hide.
More example sentences
  • Milk products were common in the form of sour cream and butter from cows and yaks.
  • Butchers from Tibet come especially to slaughter yaks whose meat is then dried and smoked.
  • Their yaks share these high, sunny pastures with blue sheep and plump marmots.

Origin

late 18th century: from Tibetan gyag.

Definition of yak in:

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There are 2 main definitions of yak in English:

yak2

Line breaks: yak
(also yack or yackety-yak) informal

noun

[in singular]
A trivial or unduly prolonged conversation: one’s time is filled with wining, dining, and yackety-yak
More example sentences
  • He was quick to raise his voice through a cordless microphone to silence the gathering engaged in a yak.
  • Certainly the bombast of cable's top yak show host, Bill O'Reilly, seems anything but cool.
  • Likewise, Laurie Brereton, Latham's numbers man, occasionally walked the floor to have a yak to colleagues.

verb (yaks, yakking, yakked)

[no object] Back to top  
Talk at length about trivial or boring subjects: she wondered what he was yakking about
More example sentences
  • All too often, diners get to the table and yack away and make the waitress come back several times.
  • So it was easier to let the old blowhard yak away and just nod occasionally.
  • This is a sweet fella, wouldn't hurt a soul, but he yaks, and yaks, and yaks.
Synonyms
prattle, blather, blether, blither, babble (on), gabble, prate, drivel, rattle on/away, ramble, maunder, go on, run on, talk at length, talk incessantly, talk a lot, chatter, yap, gossip;
Scottish & Irish slabber on
British informal rabbit, witter, waffle, natter, chunter, talk the hind legs off a donkey
North American informal run off at the mouth
Australian/New Zealand informal mag
archaic twaddle, twattle, claver, clack

Origin

1950s: imitative.

Definition of yak in: