Webster's English Dictionary

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dun

1. dun \'d*n\ \'d*n-n*s\ aj [ME, fr. OE dunn - more at DUSK] 1a: having a 
   dun color  of a horse  1b: exhibiting reduced hair pigmentation  2: marked 
   by dullness and drabness  - dun.ness n
2. dun n 1: a dun horse  2: a variable color averaging a nearly neutral 
   slightly brownish dark gray  3a: a subadult mayfly; also : an artificial 
   fly tied to imitate suc h an insect 3b: CADDIS FLY 
3. dun vt or dunned;  or dun.ning [origin unknown] 1: to make persistent 
   demands upon for payment  2: to plague or pester constantly 
4. dun n 1: one who duns  2: an urgent request; esp : a demand for payment