expression, noun
drinker; person who can hold their drink
Refers to someone who can drink a lot of alcohol without getting drunk easily. Often used in the pattern 〜はいける口だ or 〜のほうがいける口.
See also: いける
彼は日本酒がいける口だ。
He can hold his sake well.
私はどちらかというとワインのほうがいける口です。
I'm more of a wine drinker, if anything.