From Wiktionary, the free dictionary
cạn (“to down”) + chén (“Chinese-style small handleless cup”), calque of Chinese 乾杯 / 干杯 (can bôi)
cạn chén
- (literal, drinking) to down a cup of an alcoholic drink
cạn chén
- (drinking) let's down our (alcoholic) drinks
- Synonym: trăm phần trăm
