live in sin
成語所屬單字sin
live in sin — 慣用語
1. To live together as a romantic couple without being married — used especially in
1.慣用語
釋義
同居（未結婚）；未婚同居
To live together as a romantic couple without being married — used especially in older or religious contexts where this was considered morally wrong.
例句
In the 1950s, a couple who lived in sin was often looked down on by their neighbours.
Her grandmother was shocked when she learned her granddaughter was living in sin.