godan verb (-u), intransitive verb
take turns; relieve each other
Used when two or more people alternate doing something, often to share a burden or task. Implies mutual substitution.
長いドライブの間、二人で代わり合って運転した。
During the long drive, the two of us took turns driving.
仕事が大変なので
The work is tough, so let's all take turns taking breaks.