If two people are cohabiting, they are living together and have a sexual relationship, but are not married.
例句
In Italy people hardly ever cohabit...在意大利,很少有人未婚同居。The dentist left his wife of 15 years and openly cohabited with his receptionist...那个牙医离开了和他生活了15年的妻子,与自己诊所的接待小姐公开同居。
英汉词典释义
vi.
(未婚者)同居
Ann had been cohabiting with Jim for years before getting married.安在结婚前曾和吉姆同居了好几年。
英英词典释义
Verb
1. room or live together; usually said of people who are not married and live together as a couple