i Register
In some senses, dun is marked as informal, dated. Watch for register when choosing this word.
noun
A brownish grey colour.
adj
Of a brownish grey colour.
Come, thick Night, And pall thee in the dunneſt ſmoake of Hell, That my keene Knife ſee not the Wound it makes, Nor Heauen peepe through the Blanket of the darke, To cry, hold, hold.
My Miſtres eyes are nothing like the Sunne, Currall is farre more red, then her lips red, If ſnow be white, why then her breſts are dun: If hairs be wiers, black wiers grow on her head: [...]
noun
A collector of debts, especially one who is insistent and demanding.
"The truth is, Mr. Curl, I cannot write when I am plagued about trifles; and a tiresome dun this morning put to flight every idea that I had in the world." "Mr. Maynard," said the bookseller, in a solemn tone, "it is very wrong to run in debt."
Look ye, gentlemen, I have lived with credit in the world, and it grieves my heart never to stir out of my doors but to be pulled by the sleeve by some rascally dun or other.
An urgent request or demand of payment.
Miss Hoppin received a dun for volume 9 1840–1 which Mr. James McConnell, (who now pays the above) is sure was paid.