Picture a cut that nobody cleaned. It does not close. It gets warm and sore, thick liquid collects under the skin, and day by day the place gets worse instead of better. Two things make this picture: it was left alone, and time passed. Wherever this word goes, those two things go with it.
From the word’s history
The packet's Wiktionary extract traces fester to Old French festre and Latin fistula, a pipe or tube, and notes it is a doublet of fistula. A fistula is a tube-shaped sore that will not close, so the sore came first and the verb was made from it.
來源的 Wiktionary 抄錄把 fester 追到古法文 festre，再往上是拉丁文 fistula（管子），並註明它跟 fistula 是同源雙式詞。fistula 指的是一條收不了口、通到外面的瘻管，所以先有「那個爛掉的地方」這個名詞，動詞才從名詞長出來。
Wiktionary extract supplied in packet (kaikki:3f6f69a190036ae4:821045713): 'Inherited from Middle English festre … from Old French festre … from Latin fistula. The verb is derived from the noun … Doublet of fistula.'
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