Room.  She lets out her fore room and lies backwards: 
  saying of a woman suspected of prostitution.

Roost lay.  Stealing poultry.

Ropes.  Upon the high ropes; elated, in high spirits,
  cock-a-hoop.

Rose.  Under the rose:  privately or secretly.  The rose
  was, it is said, sacred to Harpocrates, the God of silence,
  and therefore frequently placed in the ceilings of rooms
  destined for the receiving of guests; implying, that
  whatever was transacted there, should not be made public.

Rosy gills.  One with a sanguine or fresh-coloured countenance.

Rotan.  A coach, cart, or other wheeled carriage.

Rot gut.  Small beer; called beer-a-bumble—­will burst
  one’s guts before it will make one tumble.

ROVERS.  Pirates, vagabonds.

Rough.  To lie rough; to lie all night in one’s clothes: 
  called also roughing it.  Likewise to sleep on the bare
  deck of a ship, when the person is commonly advised to
  chuse the softest plank.

Rough music.  Saucepans, frying-paps, poker and tongs,
  marrow-bones and cleavers, bulls horns, &c. beaten upon
  and sounded in ludicrous processions.

Rouleau.  A number of guineas, from twenty to fifty or
  more, wrapped up in paper, for the more ready circulation
  at gaming-tables:  sometimes they are inclosed in ivory boxes,
  made to hold exactly 20, 50, or 100 guineas.

Round dealing.  Plain, honest dealing.

ROUNDHEADS.  A term of reproach to the puritans and
  partizans of Oliver Cromwell, and the Rump Parliament,
  who it is said made use of a bowl as a guide to trim their
  hair.

Round robin.  A mode of signing remonstrances practised
  by sailors on board the king’s ships, wherein their
  names are written in a circle, so that it cannot be
  discovered who first signed it, or was, in other words, the
  ringleader.

Round sum.  A considerable sum.

Round about.  An instrument used in housebreaking. 
  This instrument has not been long in use.  It will cut a
  round piece about five inches in diameter out of a shutter
  or door.

Round mouth.  The fundament.  Brother round mouth,
  speaks; he has let a fart.

Rout.  A modern card meeting at a private house; also an
  order from the Secretary at War, directing the march
  and quartering of soldiers.

Row.  A disturbance; a term used by the students at
  Cambridge.

Row.  To row in the same boat; to be embarked in the
  same scheme.

Rowland.  To give a Rowland for an Oliver; to give an
  equivalent.  Rowland and Oliver were two knights famous
  in romance:  the wonderful achievements of the
  one could only be equalled by those of the other.