
Fester
Negative Progression
Used to describe situations where something is worsening over time without proper care or attention.

The abandoned house began to fester, becoming a haven for pests.
Health and Decay
Often related to infections or diseases where conditions deteriorate without treatment.

His neglected toothache festered into a severe abscess.
Emotional Association
Although primarily medical, it can metaphorically describe emotions that worsen when ignored.

Frustration with his job festered into a deep resentment.
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