Of things: to collect, to come together in a mass; to form or increase by the coming together of material.

reflexive and intransitive for reflexive (or passive). Obsolete.

intransitive in sense 1a.

intransitive. To form into a heap or mass; to increase in quantity. Now usually with up.

to brook up. [perhaps a different word.] Obsolete.

intransitive. To be formed into a heap or mass; to increase in quantity; to build up.

intransitive. To be deposited in the manner of salt, etc., round objects, in crevices, or the like. (Cf. cat, n.1 11b.)