where does run of the mill come from
Wikipedia:Run-of-the-mill Something that is run-of-the-mill is a common, everyday, ordinary item that does not stand out from the rest. Something or someone that is "run-of-the-mill" is probably not notable. The phrase "run of the mill" appears to have originated from early factory quality control and described work that had not been graded and was therefore unlikely to be either exceptionally good or exceptionally bad.[1]