Definition of mill run
1 : a test of the mineral contents of rock or ore by actual milling
2 : millrace
3 : the salable lumber output of a sawmill
4 : the common run of an article passing through a mill
5 : something or someone average, ordinary, or mediocre an unpredictable kind of man, very different from the mill run of us down here — Angus Mowat
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