The word for today is…
fester (verb, noun):
verb
1: to generate pus
2: putrefy, rot
3a: to cause increasing poisoning, irritation, or bitterness : rankle
b: to undergo or exist in a state of progressive deterioration
noun
: a suppurating sore : pustule
Source : Merriam -Webster
Etymology : Both noun and verb forms of the English word fester come from the Latin noun fistula, meaning “pipe” or, less pleasantly, “fistulous ulcer.” Accordingly, the noun fester refers to a sore that forms or discharges pus, while the oldest sense of the verb fester means “to generate pus.” A boil, for example, is a festering infection of a hair follicle. Over time, the verb—as many words do—picked up a figurative sense, and fester began to be used not only for the worsening of a wound but for a worsening state, situation, etc.
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