live in sin meaning

(old)
  To cohabit without being married

[American slang]
to live with and have sex with someone to whom one is not married. (Sometimes serious and sometimes jocular.)
  Would you like to get married, or would you prefer that we live in sin for a few more years?
  Let's live in sin. There's no risk of divorce.

• sin:    Noun: sin &nb ...
• live:    Verb: live &n ...
• live by:    live by sth not p ...

Examples

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1. as far as i'm concerned, living in sin is a lot better than turning my coat inside out.
2. we were like miserable orphans, living in sins
3. reggie, we have been living in sin for almost 20 years
4. we live in sin in this world and in shame instead of honor
5. he was living in sin and was a slave trader, buying and selling human beings