一人ひとりずつ

adverb

one by one; one at a time; in turn

Used when people do something individually, each in their own turn, or when distributing items to each person.

• 生せい徒とたちは一人ひとりずつ教きょう室しつに入はいった。

  The students entered the classroom one by one.

• プレゼントを一人ひとりずつに配くばった。

  I handed out the presents to each person one at a time.