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English definition of “fester”

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fester

verb [I] uk   /ˈfes.tər/ us    /-tɚ/

fester verb [I] (INJURY)

If a cut or other injury festers, it becomes infected and produces pus: a festering sore

fester verb [I] (FEELING)

If an argument or bad feeling festers, it continues so that feelings of hate or lack of satisfaction increase: It's better to express your anger than let it fester inside you. a festering argument/dispute
(Definition of fester from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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