(1):
(n.) A small sore which becomes inflamed and discharges corrupt matter; a pustule.
(2):
(n.) To generate pus; to become imflamed and suppurate; as, a sore or a wound festers.
(3):
(n.) To be inflamed; to grow virulent, or malignant; to grow in intensity; to rankle.
(4):
(n.) A festering or rankling.
(5):
(v. t.) To cause to fester or rankle.