Definitions of fester
British English : fester If you say that a situation, problem, or feeling is festering, you disapprove of the fact that it is being allowed to grow more unpleasant or full of anger, because it is not being properly recognized or dealt with. VERBResentments are starting to fester.
verb
- to form or cause to form pus
- (intransitive) to become rotten; decay
- to become or cause to become bitter, irritated, etc, esp over a long period of time; rankle ⇒ resentment festered his imagination
- (intransitive) (informal ) to be idle or inactive
noun
- a small ulcer or sore containing pus