Meaning of “fester” in the English Dictionary

"fester" in American English

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festerverb [ I ]

us /ˈfes·tər/

(of an injury such as a cut) to become infected and form pus (= thick yellow liquid)

fig. If a bad situation such as an argument festers, it becomes worse because it is being ignored:

It was better that she expressed her anger rather than let it fester inside her.

(Definition of “fester” from the Cambridge Academic Content Dictionary © Cambridge University Press)