~ 1
■ noun a large ox with shaggy hair, humped shoulders, and large horns, used in Tibet as a pack animal and for its milk, meat, and hide. [ Bos grunniens (domesticated) and B. mutus (its wild ancestor).]
Origin
C18: from Tibetan gyag .
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~ 2
(also yack ) informal
■ noun a trivial or unduly persistent conversation.
■ verb ( ~s , ~king , ~ked ) talk at length about trivial or boring subjects.
Origin
1950s: imitative.