live in sin
idiomPart ofsin
live in sin — idiom
1. To live together as a romantic couple without being married — used especially in
1.idiom
Definition
To live together as a romantic couple without being married — used especially in older or religious contexts where this was considered morally wrong.
Example
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.