noun
mixed doubles
Used in sports such as tennis, badminton, and table tennis for a match where each team consists of one male and one female player.
wasei-eigo (Japanese-coined English), from mix doubles
テニスのミックスダブルスで金メダルを取った。
They won the gold medal in tennis mixed doubles.
Variant spelling with a middle dot; less common but still seen.
Wasei-eigo from English 'mix doubles', adapted into Japanese as ミックスダブルス.