till the cows come home

US /tɪl ðə kaʊz kʌm hoʊm/
UK /tɪl ðə kaʊz kʌm hoʊm/
"till the cows come home" picture
1.

到天荒地老, 没完没了

for a very long time; indefinitely

:
You can argue about it till the cows come home, but it won't change anything.
你可以争论到天荒地老,但这不会改变任何事情。
She can talk about her cats till the cows come home.
她可以没完没了地谈论她的猫。