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ménage à trois

A sexual encounter or relationship between three people. Although exciting at first, the ménage à trois caused their relationship to suffer and ultimately end.
See also: ménage, trois

a ménage à trois

an arrangement in which three people who have a sexual relationship live together They married in '73 and then met Russell with whom they entered a brief but idyllic ménage à trois.
See also: ménage, trois