/ jæk; NAmE / noun , verb
■ noun
an animal of the cow family, with long horns and long hair, that lives in central Asia
■ verb
(also yack ) ( -kk- ) [ v ] ( informal , often disapproving ) to talk continuously about things that are not very serious or important :
She just kept yakking on.
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WORD ORIGIN
noun late 18th cent.: from Tibetan gyag .
verb 1950s: imitative.