To live together with someone else, especially in a romantic and sexual relationship but without being married.
To coexist in common environs with.
To join or commit to, more or less permanently, as if in marriage.
To wager, stake, bet, place a bet, make a wager.
To take as one's spouse.
To take a spouse.
To take each other as a spouse.
To perform the marriage ceremony for; to join in matrimony.
To take to oneself and support; to espouse.