live in sin

present singular third person lives in sin · participle present living in sin · participle past lived in sin · past lived in sin

1. idiomaticintransitiveTo cohabit as if husband and wife without being married.

   Ralph: Athene gone and got married? Builder: No. It's—it's that she's gone and—and not got married. . . . I suppose you'd have me eat humble pie and tell Athene she can go on living in sin and offending society.

   1922, John Galsworthy, A Family Man, act 2

   Synonyms: live over the brush, play house