The word for today is…
fester (verb):
1 : to generate pus
2a : to cause increasing poisoning, irritation, or bitterness
b : to undergo or exist in a state of progressive deterioration
Source : Merriam -Webster
Etymology : Fester comes from Latin fistula, meaning “pipe” or “fistulous ulcer.” Fistula, in English, refers to an abnormal passage leading from an abscess or hollow organ and permitting passage of fluids or secretions. The word’s use as a verb meaning “to generate pus” influenced its use as a word implying a worsening state.
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