Dictionary definition · dun
noun
- horse of a dull brownish grey color
- a color or pigment varying around a light grey-brown color"she wore dun"
verb
- treat cruelly"The children tormented the stuttering teacher"
- persistently ask for overdue payment"The grocer dunned his customers every day by telephone"
- cure by salting"dun codfish"
- make a dun color
adjective
- of a dull greyish brown to brownish grey color"the dun and dreary prairie"
Source: Open English WordNet (CC BY 4.0).