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.
sit-in is a noun meaning "a form of civil disobedience in which demonstrators occupy seats and refuse to move". It carries one recorded sense.
a form of civil disobedience in which demonstrators occupy seats and refuse to move
Definitions, synonyms and semantic relations for sit-in come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.