noun
favorite snack to have with drinks
Refers to a preferred food or snack enjoyed alongside alcoholic beverages, similar to 'drinking snack' or 'bar snack' but with a personal favorite nuance.
彼の好下物は枝豆だ。
His favorite snack to have with drinks is edamame.
この店の好下物メニューが充実している。
This restaurant has a great selection of snacks to go with drinks.
酒の肴 is a broader term for any food that goes well with sake or alcohol, not necessarily a personal favorite.
Compound of 好 (こう, 'like, favorite'), 下 (か, 'under, with'), and 物 (ぶつ, 'thing'). Literally 'a thing one likes with (drinks)'. The exact historical derivation is uncertain, but the spelling is conventionally associated with this meaning.