What does 轮流 (lún liú) mean in English?

Card 639HSK 2010 Level 5639/1311
CARD639
PROGRESS49%
轮流
輪流
lún liú
to alternate; to take turns

Reveal: Click/Space/Enter/↑↓/w/s/j/kNavigate: ←→/h/l/a/d