~ずつ (each, at a time)

She'd been setting aside a little money each month, in preparation for retirement.

Here, your offering… 10 yen each, okay. Here you go, Miu-chan.

The green leaves are gradually coming out.

Learn a little bit every day.

Every week, Mr. Tanaka saves a little money just in case.

The club members decided to give each senior a brooch, one at a time.

She gives each child two apples.

She gave each of them two.

She cut the cake into six pieces and gave one to each child.

Rust is slowly corroding the metal parts.

Pack the eggs one dozen at a time.

The postman delivers mail to each house in turn.

Please enter the room one person at a time.