fester - definition and synonyms

verb [intransitive] 

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/ˈfestə(r)/
present tense
I/you/we/theyfester
he/she/itfesters
present participlefestering
past tensefestered
past participlefestered
  1. 3
    if a problem or unpleasant feeling festers, it becomes worse because no one has dealt with it