'til the cows come home

'til the cows come home

For a very long, indefinite amount of time; forever. You can wait 'til the cows come home, but you'll never see that law passed in this country! My wife was talking on the phone with her sister 'til the cows came home last night!
See also: come, cow, home
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

(un)til the cows come home

Rur. until the last; until very late. (Referring to the end of the day, when the cows come home to be fed and milked.) We were having so much fun that we decided to stay at the party until the cows camehome. Where've you been? Who said you could stay out till the cows come home?
See also: come, cow, home, til
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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