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till the cows come home

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till the cows come home

Also, when the cows come home. For a long time, as in You can keep asking till the cows come home, but you still may not go bungee-jumping. This term alludes to when the cows return to the barn for milking. [Late 1500s]

See also: come, cow, home, till

till the cows come home

Informal

For a very long time; indefinitely: They could argue till the cows come home and still not reach an agreement.

See also: come, cow, home, till