(intransitive, adverb) (esp of an unmarried couple) to dwell in the same house or flat; cohabit
Idioms and Phrases with live together
live together
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 ]