till/until the cows come home

idiom

Definition of till/until the cows come home

informal
: for a very long time They'll be arguing about this till the cows come home.

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“Till/until the cows come home.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/till%2Funtil%20the%20cows%20come%20home. Accessed 13 December 2019.

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