mod. average; typical. (Referring to the typical quality of a product that comes out of a mill.) : This stuff is just run-of-the-mill.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
run-of-the-mill
"unspectacular," 1909, lit. in ref. to material yielded by a mill, etc., before sorting for quality. Fig use is from 1930.
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