till the cows come home
US /tɪl ðə kaʊz kʌm hoʊm/
UK /tɪl ðə kaʊz kʌm hoʊm/

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。