take turns
To do something one after another instead of doing it all at the same time. To alternate, to change people while doing something.
In class we should not talk all at the same time; we should take turns.
Jean and Beth took turns on the swing.
The two boys took turns at digging the hole.
The three men took turns driving so one would not be too tired.
During the trip, Darlene and I took turns driving so that neither of us would tire out.
I have to make sure that my two sons take turns playing the video game.