Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
strait-laced is an adjective meaning "exaggeratedly proper". It carries one recorded sense.
exaggeratedly proper
“my straitlaced Aunt Anna doesn't approve of my miniskirts”
Definitions, synonyms and semantic relations for strait-laced come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.