Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
set-back is a noun meaning "structure where a wall or building narrows abruptly". It carries one recorded sense.
Definitions, synonyms and semantic relations for set-back come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.