fester

verb

If you don't clean the wound properly, it can fester and become infected.

意味（1）

(intransitive) To become septic; to become rotten.

[W]ounds immedicable / Ranckle, and feſter, and gangrene, / To black mortification.

意味（2）

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

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

意味（3）

(transitive) To cause to fester or rankle.