Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
lower-middle-class is an adjective meaning "occupying the lower part of the middle socioeconomic range in a society". It carries one recorded sense.
occupying the lower part of the middle socioeconomic range in a society
Definitions, synonyms and semantic relations for lower-middle-class come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .