Dun.  An importunate creditor.  Dunny, in the provincial
  dialect of several counties, signifies deaf; to dun, then,
  perhaps may mean to deafen with importunate demands: 
  some derive it from the word DONNEZ, which signifies give. 
  But the true original meaning of the word, owes its birth
  to one Joe Dun, a famous bailiff of the town of Lincoln, so
  extremely active, and so dexterous in his business, that it
  became a proverb, when a man refused to pay, Why do not
  you dun him? that is, Why do not you set Dun to attest
  him?  Hence it became a cant word, and is now as old as
  since the days of Henry VII.  Dun was also the general
  name for the hangman, before that of Jack Ketch.

      And presently a halter got,
      Made of the best strong hempen teer,
      And ere a cat could lick her ear,
      Had tied it up with as much art,
      As dun himself could do for’s heart.

      Cotton’s Virgil Trav. book iv.

DUNAKER.  A stealer of cows and calves.

Dunegan.  A privy.  A water closet.

Dunghill.  A coward:  a cockpit phrase, all but gamecocks
  being styled dunghills.  To die dunghill; to repent, or shew
  any signs of contrition at the gallows.  Moving dunghill;
  a dirty, filthy man or woman.  Dung, an abbreviation of
  dunghill, also means a journeyman taylor who submits to
  the law for regulating journeymen taylors’ wages, therefore
  deemed by the flints a coward.  See flints.

Dunnock.  A cow.  Cunt.

To dup.  To open a door:  a contraction of do ope or open. 
  See dub.

Durham man.  Knocker kneed, he grinds mustard with
  his knees:  Durham is famous for its mustard.

Dust. Money.  Down with your dust; deposit the money. 
  To raise or kick up a dust; to make a disturbance or riot: 
  see breeze.  Dust it away; drink about.

Dustman.  A dead man:  your father is a dustman.

Dutch Comfort.  Thank God it is no worse.

Dutch concert.  Where every one plays or signs a
  different tune.

Dutch feast. Where the entertainer gets drunk before
  his guest.

Dutch reckoning, or ALLE-mal.  A verbal or lump
  account, without particulars, as brought at spungiug or
  bawdy houses.

Dutchess.  A woman enjoyed with her pattens on, or by a
  man-in boots, is said to be made a dutchess.

Die hard, or game.  To die hard, is to shew no signs of
  fear or contrition at the gallows; not to whiddle or squeak. 
  This advice is frequently given to felons going to suffer the
  law, by their old comrades, anxious for the honour of the
  gang.