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English definition of “fester”

fester

verb [I]  /ˈfes·tər/ us  
(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)
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