Refers to a person who drinks alcohol, often implying a heavy or habitual drinker. Used in contexts like health, lifestyle, or social commentary.
He is quite a drinker and drinks whiskey every night.
At the health checkup, the doctor told me, 'You're a drinker, aren't you?'
Borrowed from English 'drinker'. The exact date of borrowing is uncertain, but it is used in modern Japanese to refer to a person who drinks alcohol, especially heavily.