Fes″ter (?), v. i. [imp. & p. p.Festered (?); p. pr. & vb. n.Festering.] [OE. festern, fr. fester, n.; or fr. OF. festrir, fr. festre, n. See Fester, n.] 1. To generate pus; to become imflamed and suppurate; as, a sore or a wound festers.
Wounds immedicable
Rankle, and fester, and gangrene. Milton.
Unkindness may give a wound that shall bleed and smart, but it is treachery that makes it fester. South.
Hatred... festered in the hearts of the children of the soil. Macaulay.
2. To be inflamed; to grow virulent, or malignant; to grow in intensity; to rankle.