till the cows come home
<abbr style="text-decoration: underline;" title="till / until" > till</abbr>
tɪl
til
the
ðə
dhē
cows
kaʊz
kawz
come
kʌm
kam
home
həʊm
hewm

Definition & Meaning of "till the cows come home"in English

till the cows come home
01

used to describe a prolonged or indefinite period of time, often implying that something will continue for a very long duration 

(till|until) the cows come home definition and meaning
Idiom
Informal

What is the origin of the idiom "till the cows come home" and when to use it?

The origin of the idiom "till the cows come home" can be traced back to rural and agricultural settings. In farming communities, cows are typically brought back to the barn or milking area at the end of the day. The phrase likely originated from the observation that cows often take their time to return home, moving slowly or grazing along the way. As a result, the expression came to represent a prolonged or indefinite period of time. It has been used in literature and everyday language for centuries to convey the idea of a lengthy or seemingly endless duration.

Examples
You can argue until the cows come home, but she will not change her mind. 
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