Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
run-of-the-mill is an adjective meaning "not special in any way; lacking distinction". It carries one recorded sense.
not special in any way; lacking distinction
“run-of-the-mill boxing”
“your run-of-the-mine college graduate”
“a unexceptional an incident as can be found in a lawyer's career”
Definitions, synonyms and semantic relations for run-of-the-mill come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.