till the cows come home
US /tɪl ðə kaʊz kʌm hoʊm/
UK /tɪl ðə kaʊz kʌm hoʊm/
1.
for a very long time; indefinitely
:
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You can argue about it till the cows come home, but it won't change anything.
•
She can talk about her cats till the cows come home.