プログレッシブ和英中辞典(第4版)の解説
なこうど【仲人】
a go-between; a matchmaker
仲人をする
act as go-between／arrange a marriage ((between A and B))
田中夫妻の仲人で結婚した
《文》 They got married through the good offices of Mr. and Mrs. Tanaka.
仲人口
あの娘をあんなにほめているが，あれは仲人口だよ
He is saying all those nice things about her, as matchmakers will.