From Longman Dictionary of Contemporary Englishlive in sinlive in sinold-fashionedLIVE WITH somebody if people live in sin, they live together and have a sexual relationship without being married → live together → live
Examples from the Corpus
live in sin• We were, after all, living in sin, and she was a devoted Catholic.live in sinlive in sinold-fashionedRELATIONSHIP if two people live in sin, they live together in a sexual relationship without being married → sinExamples from the Corpus
live in sin• We were, after all, living in sin, and she was a devoted Catholic. 