飲干す

(1)drink down entirely; "He downed three martinis before dinner"; "She killed a bottle of brandy that night"; "They popped a few beer after work"

(2)完全に飲んでしまう

(3)drink to the last drop; "drink up--there's more wine coming"

(4)最後の一滴まで飲む、飲み干す

(1)