Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
sit-down is a noun meaning "a strike in which workers refuse to leave the workplace until a settlement is reached". It carries one recorded sense.
a strike in which workers refuse to leave the workplace until a settlement is reached
Definitions, synonyms and semantic relations for sit-down come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.