live together

/ lɪv /

verb

1. (intr, adverb) (esp of an unmarried couple) to dwell in the same house or flat; cohabit

Idioms and Phrases

Cohabit, especially when not married. For example, “I ... am only concerned that their living together before the marriage took place should be so generally known” (Jane Austen, Pride and Prejudice, 1813). [c. 1800] Also see live in sin.