I. ˈdən adjective
Etymology: Middle English, from Old English dunn — more at dusk
Date: before 12th century
1.
a. : having the color dun
b. of a horse : having a grayish-yellow coat with black mane and tail
2. : marked by dullness and drabness
• dun·ness ˈdən-nəs noun
II. noun
Date: 14th century
1. : a dun horse
2. : a variable color averaging a nearly neutral slightly brownish dark gray
3. : a subadult mayfly ; also : an artificial fly tied to imitate such an insect
III. transitive verb
( dunned ; dun·ning )
Etymology: origin unknown
Date: circa 1626
1. : to make persistent demands upon for payment
2. : plague , pester
IV. noun
Date: 1628
1. : a person who duns
2. : an urgent request ; especially : a demand for payment