Meaning of the word "Live in sin" in English

What does "Live in sin" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

Live in sin

US /lɪv ɪn sɪn/
UK /lɪv ɪn sɪn/

Idiom

to live together as if married without being legally married, especially from a religious or moral perspective

Example:
In some conservative communities, couples who live in sin are often ostracized.
Her parents were shocked when they found out she was going to live in sin with her boyfriend.