noun
A formal, literary yojijukugo for a person who arranges marriages or acts as an intermediary in romantic relationships. Often used in historical or elegant contexts; in modern casual speech, 仲人 (なこうど) is more common.
彼は二人の結婚の月下氷人を務めた。
He acted as the go-between for the couple's marriage.
In the past, it was common for a matchmaker to arrange marriages.