二人ふたりずつ

adverb, noun which may take the genitive case particle 'no'

two by two; in pairs; as a couple

Describes doing something in groups of two, or distributing items two per person/unit.

• 生せい徒とたちは二人ふたりずつ並ならんで歩あるいた。

  The students walked in pairs.

• このプリントを二人ふたりずつに配くばってください。

  Please hand out two copies of this handout to each pair.