IDIOM: RUN-OF-THE-MILL – this idiom is used to mean that something is very ordinary, normal or common-place.
Example: I wasn’t very impressed by their wedding. The whole celebration was very run-of-the-mill. I doubt I will remember it at all in a few years.
If you are using run–of–the–mill in your writing, be sure to remember to punctuate it properly!
Watch and see how this idiom is used by native English speakers! This video shows how Ed Miliband uses the idioms run-of-the-mill and slippery slope to add extra value to his speech at an emergency sitting in the House of Commons.
https://youtu.be/u7PLbhWzjfQ