fester

1. V-I 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. 恶化[表不满]

Resentments are starting to fester. 仇恨正开始逐步加深。

2. V-I If a wound festers, it becomes infected, making it worse. 化脓

The wound is festering, and gangrene has set in. 伤口在化脓，继而发生了坏疽。