Definition of "yack" in English

noun

1. Alternative form of yak (“chatter; talk”).

verb

1. Alternative form of yak (“talk; vomit”).

   • I moved to another carriage on the train because the first one was full of people yacking on mobile phones.

noun

1. (England, dialectal, possibly obsolete) An oak.

   • If 't ash tree buds before 't yack, […]

noun

1. (UK, thieves slang, obsolete) A watch (timepiece).