Dun, n. 1. One who duns; a dunner.

To be pulled by the sleeve by some rascally dun.

2. An urgent request or demand of payment; as, he sent his debtor a dun.

Dun, a. [AS. dunn, of Celtic origin; cf. W. dwn, Ir. & Gael. donn.] Of a dark color; of a color partaking of a brown and black; of a dull brown color; swarthy.

Summer's dun cloud comes thundering up.

Chill and dun
Falls on the moor the brief November day.

Dun crow (Zoöl.), the hooded crow; -- so called from its color; -- also called hoody, and hoddy. -- Dun diver (Zoöl.), the goosander or merganser.

Dun, v. t. To cure, as codfish, in a particular manner, by laying them, after salting, in a pile in a dark place, covered with salt grass or some like substance.

Dun (?), n. [See Dune.] A mound or small hill.

Dun (dŭn), v. t. & i. [imp. & p. p. Dunned (dŭnd); p. pr. & vb. n. Dunning (dŭn"nĭng).] [AS. dyne noise, dynian to make a noise, or fr. Icel. dynr, duna, noise, thunder, duna to thunder; the same word as E. din. √74. See Din.] To ask or beset, as a debtor, for payment; to urge importunately.

Hath she sent so soon to dun?