\Dun\, n. [See {Dune}.]
A mound or small hill.

\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\, v. t. & i. [imp. & p. p. {Dunned}; p. pr. & vb. n.
{Dunning}.] [AS. dyne noise, dynian to make a noise, or fr.
Icel. dynr, duna, noise, thunder, duna to thunder; the same
word as E. din. ???. See {Din}.]
To ask or beset, as a debtor, for payment; to urge
importunately.
      Hath she sent so soon to dun?            --Swift.

\Dun\, n.
1. One who duns; a dunner.
         To be pulled by the sleeve by some rascally dun.
                                               --Arbuthnot.
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.  -- Pierpont.
      Chill and dun Falls on the moor the brief November day.
                                               --Keble.
{Dun crow} (Zo["o]l.), the hooded crow; -- so called from its
   color; -- also called {hoody}, and {hoddy}.
{Dun diver} (Zo["o]l.), the goosander or merganser.