To generate pus; to become imflamed and suppurate; as, a sore or a wound festers.
- To generate pus; suppurate.
- To form an ulcer.
- To undergo decay; rot.
- To be or become an increasing source of irritation or poisoning; rankle: bitterness that festered and grew.
- To be subject to or exist in a condition of decline: allowed the once beautiful park to fester.
- To infect, inflame, or corrupt.
- A small festering sore or ulcer; a pustule.