cohabit
/kəʊˈhæbɪt/
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If two people are cohabiting, they are living together and have a sexual relationship, but are not married. 同居
verb [vt. 及物动词] 同居（尤指未婚而同居者）
About one-third of all people cohabit at some time in their lives. 大约有三分之一的人曾与人同居。
