三さん人にん組ぐみ

noun

trio; group of three; threesome

Refers to a group or set of three people, often with a sense of them acting together. Can be neutral or carry a slightly informal, sometimes conspiratorial nuance depending on context.

• あの三さん人にん組ぐみはいつも一いっ緒しょにいる。

  That trio is always together.

• 銀ぎん行こう強ごう盗とうは三さん人にん組ぐみだった。

  The bank robbers were a gang of three.