fester

verb (used without object)

1. to form pus; generate purulent matter; suppurate.
2. to cause ulceration, as a foreign body in the flesh.
3. to putrefy or rot.
4. to rankle, as a feeling of resentment.

verb (used with object)

5. to cause to rankle: Malice festered his spirit.

noun

6. an ulcer; a rankling sore.
7. a small, purulent, superficial sore.

verb

1. to form or cause to form pus
2. (intr) to become rotten; decay
3. to become or cause to become bitter, irritated, etc, esp over a long period of time; rankleresentment festered his imagination
4. (intr) informal to be idle or inactive

noun

5. a small ulcer or sore containing pus

v.

1. To ulcerate.
2. To form pus; putrefy.

n.

1. An ulcer.