expression, godan verb (-su)
drink the cup dry; drain one's cup
Idiomatic expression for drinking all the sake (or other alcohol) in one's cup, often in a social or ceremonial context.
乾杯の音頭で、全員が杯を干した。
At the toast, everyone drained their cups.
彼は一気に杯を干して
He drained his cup in one gulp and ordered another.