a person who drinks alcohol often; a drinker or drunkard (often with a somewhat pejorative or colloquial tone).
彼は昔からの酒飲みで、週末は必ず居酒屋に行く。
He's been a drinker for a long time and always goes to an izakaya on weekends.
酒飲みの親戚が集まると、話が盛り上がる反面、トラブルも起きやすい。
When the drinking relatives get together, conversation livens up but trouble is also more likely to occur.
彼女は自分が酒飲みだとは認めないが、よく飲みに行くのは事実だ。
She won't admit she's a drinker, but it's true that she often goes out drinking.
父は若い頃はかなりの酒飲みだったと聞いている。
I've heard that my father was quite a heavy drinker when he was young.