Rats.  Of these there are the following kinds:  a black rat
  and a grey rat, a py-rat and a cu-rat.

Rattle.  A dice-box.  To rattle; to talk without consideration,
  also to move off or go away.  To rattle one off;
  to rate or scold him.

Rattle-pate.  A volatile, unsteady, or whimsical man or
  woman.

Rattle-traps.  A contemptuous name for any curious
  portable piece of machinery, or philosophical apparatus.

Rattler.  A coach.  Rattle and prad; a coach and horses.

Rattling cove.  A coachman.  Cant.

Rattling MUMPERS.  Beggars who ply coaches.  Cant.

RAWHEAD and bloody bones.  A bull beggar, or scarechild,
  with which foolish nurses terrify crying brats.

Reader.  A pocket-book.  Cant.

Reader merchants.  Pickpockets, chiefly young Jews,
  who ply about the Bank to steal the pocket-books of
  persons who have just received their dividends there.

Ready.  The ready rhino; money.  Cant.

Rebus.  A riddle or pun on a man’s name, expressed in
  sculpture or painting, thus:  a bolt or arrow, and a tun,
  for Bolton; death’s head, and a ton, for Morton.

Receiver general.  A prostitute.

Reckon.  To reckon with one’s host; to make an erroneous
  judgment in one’s own favour.  To cast-up one’s reckoning
  or accounts; to vomit.

To recruit.  To get a fresh supply of money.

Recruiting service.  Robbing on the highway.

Red fustian.  Port wine.

Red lane.  The throat.  Gone down the red lane; swallowed.

Red ribbin.  Brandy.

Red lattice.  A public house.

Red letter day.  A saint’s day or holiday, marked in
  the calendars with red letters.  Red letter men; Roman
  Catholics:  from their observation of the saint days
  marked in red letters.

Red rag.  The tongue.  Shut your potatoe trap, and
  give your red rag a holiday; i.e. shut your mouth, and
  let your tongue rest.  Too much of the red rag (too much
  tongue).

Red sail-yard DOCKERS.  Buyers of stores stolen out of
  the royal yards and docks.

Red shank.  A Scotch Highlander.

Regulars.  Share of the booty.  The coves cracked the
  swell’s crib, fenced the swag, and each cracksman napped
  his regular; some fellows broke open a gentleman’s house,
  and after selling the property which they had stolen,
  they divided the money between them.

Religious horse.  One much given to prayer, or apt to
  be down upon his knees.