fester

/ˈfestər/ verb [I]

Definition

FEELING › If a bad feeling or situation festers, it becomes worse over a period of time: Hatred between the two groups has festered for years.

INJURY › If an injury festers, it becomes infected: a festering wound

(Definition of fester verb from the Cambridge Learner's Dictionary © Cambridge University Press)

to do something that spoils someone's plans

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