Dripper.  A gleet.

Dromedary.  A heavy, bungling thief or rogue.  A purple
  dromedary; a bungler in the art and mystery of thieving. 
  Cant.

DROMMERARS.  See DOMMERER.

Drop.  The new drop; a contrivance for executing felons at
  Newgate, by means of a platform, which drops from
  under them:  this is also called the last drop.  See leaf. 
  See morning drop.

Drop A cog.  To let fall, with design, a piece of gold or
  silver, in order to draw in and cheat the person who sees
  it picked up; the piece so dropped is called a dropt cog.

Drop in the eye.  Almost drunk.

Dropping member.  A man’s yard with a gonorrhoea.

Drop coves.  Persons who practice the fraud of dropping
  a ring or other article, and picking it up before the
  person intended to be defrauded, they pretend that the
  thing is very valuable to induce their gull to lend them
  money, or to purchase the article.  See fawny rig,
  and money droppers.

To drop down.  To be dispirited.  This expression is
  used by thieves to signify that their companion did not
  die game, as the kiddy dropped down when he went to
  be twisted; the young fellow was very low spirited when
  he walked out to be hanged.

To drub.  To beat any one with a stick, or rope’s end: 
  perhaps a contraction of dry rub.  It is also used to signify
  a good beating with any instrument.

Drummer.  A jockey term for a horse that throws about
  his fore legs irregularly:  the idea is taken from a kettle
  drummer, who in beating makes many flourishes with
  his drumsticks.

Drunk.  Drunk as a wheel-barrow.  Drunk as David’s
  sow.  See David’s sow.

Drury lane ague.  The venereal disorder.

Drury lane Vestal.  A woman of the town, or prostitute;
  Drury-lane and its environs were formerly the residence
  of many of those ladies.

Dry bob.  A smart repartee:  also copulation without
  emission; in law Latin, siccus robertulus.

Dry boots.  A sly humorous fellow.

Dub.  A picklock, or master-key.  Cant.

Dub lay.  Robbing houses by picking the locks.

Dub the Jigger.  Open the door.  Cant.

Dub O’ th’ hick.  A lick on the head.

Dubber.  A picker of locks.  Cant.

Duce.  Two-pence.

Duck.  A lame duck; an Exchange-alley phrase for a
  stock-jobber, who either cannot or will not pay his losses,
  or, differences, in which case he is said to waddle out of
  the alley, as he cannot appear there again till his debts
  are settled and paid; should he attempt it, he would be
  hustled out by the fraternity.