run-of-the-mill

/ˌˈrʌn ə(v) ðə ˌmɪl/

Something run-of-the-mill is average and unexceptional. Nothing unusual happens during a run-of-the-mill day.

Originally, this term has to do with material produced by a mill — such as lumber — that had the same size and quality. From there, it came to refer to other things that don't vary. A run-of-the-mill baseball player is ordinary: not great, but not terrible. A run-of-the-mill school grade is C. If something is very good or bad, it's noteworthy and therefore not run-of-the-mill.

Definitions of run-of-the-mill

1. adjective

   not special in any way
   “run-of-the-mill boxing”

   synonyms: mine run, run-of-the-mine, unexceptional

   ordinary

   not exceptional in any way especially in quality or ability or size or degree