Definition of "fester" in English

noun

1. (pathology, obsolete) A fistula.

2. (pathology) A sore or an ulcer of the skin.

3. The condition of something that festers; a festering; a festerment.

verb

1. (intransitive) To become septic; to become rotten.

2. (intransitive) To worsen, especially due to lack of attention.

   • Deal with the problem immediately; do not let it fester.

3. (transitive) To cause to fester or rankle.

   • For which I burnt in inward sweltring hate, / And festred rankling malice in my breast, / Till I might belke revenge upon his eyes: […]