1903, in the meaning defined at sense 1
Where Does 'Run-of-the-Mill' Come From?
A top-of-the-line history
run-of-the-mill
run-of-the-mine
runological
“Run-of-the-mine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/run-of-the-mine. Accessed 24 Nov. 2024.
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