One way to hold grunge: the dark layer that has sat on something too long and will not wipe off — the ring in the bath, the film on an old . Everything else the word does keeps that not-cleaned-up feeling.
「grunge」的核心畫面可以想成那一層擦不掉的髒。浴缸底那圈黑黑的東西，或是爐台上結住的油。不是剛落下的灰塵，而是放太久、黏住了的那種。這個字走到哪裡，都還帶著「沒有整理乾淨」的味道。
From the word’s history
Wiktionary records grunge as a back-formation from grungy, so the adjective for dirty came first and the noun was cut out of it.
來源資料說 grunge 是從形容詞 grungy（髒兮兮的）倒推出來的名詞。也就是先有「髒的」這個形容詞，之後才把名詞切出來。這條線索正好對上它核心的髒感。
Wiktionary, "grunge"
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