intransitive. To suppurate, gather; to develop or become affected with wheals.

intransitive. To grow rank; to rot, fester, rankle.

To fester, esp. to a degree that causes pain; to putrefy, rot. Also (esp. in later use) in figurative… intransitive. Of a wounded or diseased…

intransitive. To become a fester (fester, n. 1a); to suppurate; to become infected. Frequently in figurative contexts.

intransitive. Of organic matter, esp. of animal origin: to become putrid; to rot, go bad; to undergo bacterial decomposition with the production of…

intransitive and transitive in passive. To become purulent; to fill with pus.

intransitive. = suppurate, v. Occasionally also transitive.

to come to a head: (a) (of a boil, abscess, or spot) to form a head and come to the point where likely to burst; cf. sense 19a; (b) (of a…

intransitive. To suppurate or fester inwardly.

intransitive. To form or discharge pus; (of an abscess) to come to a head, to ripen. In early use also: †to become pus (obsolete). Also figurative.

to fester.

intransitive (for reflexive). To suppurate. Obsolete.

intransitive. Of a boil, abscess, etc.: to ripen, suppurate. Cf. mature, v. 1b.