take turns

Entry Definition
back and forth, taking turns, alternating
s/he hits h/ back and forth (e.g., punching bag); (plural) they hit or shove h/ back and forth between them, they take turns hitting or shoving h/
s/he hits it back and forth (e.g., gong); (plural) they hit or shove it back and forth between them, they take turns hitting or shoving it
s/he, it goes back and forth, takes turns, alternates
back and forth; (two people, etc.) taking turns, alternating