day in day out is an adverb meaning "for an indefinite number of successive days". It carries one recorded sense.
for an indefinite number of successive days
Definitions, synonyms and semantic relations for day in day out come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.
147,478 entries in AltF Lexicon, 83,117 of them with their syllables marked.
Look up another word