noun
Refers to a person who habitually drinks a large amount of alcohol; often carries a slightly negative or critical tone.
彼は大酒飲みで、毎晩一升瓶を空ける。
He is a heavy drinker and empties a 1.8-liter bottle every night.
酒好き is a more general term for someone who likes alcohol, without necessarily implying excessive consumption, while 大酒飲み specifically emphasizes drinking large quantities.
Compound of 大 (おお, 'big, large') + 酒 (さけ, 'alcohol') + 飲み (のみ, 'drinking', nominalized form of 飲む). Literally 'big alcohol drinking'.