"yaks" in the noun sense
1. yak, yack, yakety-yak, chatter, cackle
2. yak, Bos grunniens
large long-haired wild ox of Tibet often domesticated
"yaks" in the verb sense
1. yak, gab
"she was yakking away about her grandchildren"
Source: WordNet® (An amazing lexical database of English)
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