Dun v. t. & i. [imp. & p. p. Dunned p. pr. & vb. n. Dunning ]  To ask or beset (e.g., a debtor), for payment; to urge importunately.
     Hath she sent so soon to dun?   --Swift.
  dun
       adj : of a dull grayish brown to brownish gray color; "the dun and
             dreary prairie"
       n 1: horse of a dull brownish gray color
       2: a color varying around light grayish brown; "she wore a dun
          raincoat" [syn: grayish brown, greyish brown, fawn]
       v 1: treat cruelly; "The children tormented the stuttering
            teacher" [syn: torment, rag, bedevil, crucify, frustrate]
       2: persistently ask for overdue payment; "The grocer dunned his
          customers every day by telephone"
       3: cure by salting; "dun codfish"
       4: make a dun color
       [also: dunning, dunned, dunnest, dunner]