What does ＡＡ制 (aa zhì) mean in English?

Card 14NPCR Level 3714/55
CARD14
PROGRESS25%
ＡＡ制
aa zhì
(to go) dutch(Noun)
Click to reveal
← Previous↑ DeckNext →

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