Boozer
Drunkard
noun
We have alcohol and a variant form of 飲む (to drink). So you know this has to do with drinking alcohol. It means a boozer or a drunkard, someone who drinks a lot of alcohol!
The readings are the vocab words お酒 and 飲む combined together into one. You can guess it's a kun'yomi reading because of the み on the end of 飲, which should make you think back to vocab words that use these kanji and the kun'yomi readings. If you can do that, you can read this word (and many others, probably!).
子どものくせにスルメがすきだなんて、こりゃぁこの子はしょう来酒飲みになるねぇ。
He likes dried cuttlefish, even though he is a kid, eh? He could be a boozer in the future.
コウイチはお酒は好きだけど、酒飲みってほどじゃあないですよ。
Koichi likes drinking, but he isn't like an alcoholic.
彼は大酒飲みだが、赤ワインが苦手だ。
He’s a heavy drinker but he doesn’t like red wine.