Definition of strait-laced adjective from the Oxford Advanced Learner's Dictionary

 

strait-laced

 adjective
(also straight-laced)adjective
BrE BrE//ˌstreɪt ˈleɪst//
 
; NAmE NAmE//ˌstreɪt ˈleɪst//
 
(disapproving) Moral
 
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having strict or old-fashioned ideas about people’s moral behaviour See related entries: Moral
See the Oxford Advanced American Dictionary entry: strait-laced