Irish apricots.  Potatoes.  It is a common joke against
  the Irish vessels, to say they are loaded with fruit and
  timber, that is, potatoes and broomsticks.  Irish assurance;
  a bold forward behaviour:  as being dipt in the river Styx
  was formerly supposed to render persons invulnerable,
  so it is said that a dipping in the river Shannon totally
  annihilates bashfulness; whence arises the saying of an
  impudent Irishman, that he has been dipt in the Shannon.

Irish beauty.  A woman with two black eyes.

Irish evidence.  A false witness.

Irish legs.  Thick legs, jocularly styled the Irish arms. 
  It is said of the Irish women, that they have a dispensation
  from the pope to wear the thick end of their legs downwards.

Irish toyles.  Thieves who carry about pins, laces, and
  other pedlars wares, and under the pretence of offering
  their goods to sale, rob houses, or pilfer any thing they
  can lay hold of.

Iron.  Money in general.  To polish the king’s iron with
  one’s eyebrows; to look out of grated or prison windows,
  or, as the Irishman expresses them, the iron glass
  windows.  Iron doublet; a prison.  See stone doublet.

IRONMONGER’S shop.  To keep an ironmonger’s shop by
  the side of a common, where the sheriff sets one up; to be
  hanged in chains.  Iron-bound; laced.  An iron-bound
  hat; a silver-laced hat.

Island.  He drank out of the bottle till he saw the island;
  the island is the rising bottom of a wine bottle, which
  appears like an island in the centre, before the bottle is
  quite empty.

Ivories.  Teeth.  How the swell flashed his ivories; how
  the gentleman shewed his teeth.

ITCHLAND, or SCRATCHLAND.  Scotland.

Jug.  See double jug.

JUGGLER’S box.  The engine for burning culprits in the
  hand.  Cant.

JUKRUM.  A licence.

JUMBLEGUT lane.  A rough road or lane.

Jump.  The jump, or dining-room jump; a species of robbery
  effected by ascending a ladder placed by a sham lamp-
  lighter, against the house intended to be robbed.  It is so
  called, because, should the lamp-lighter be put to flight,
  the thief who ascended the ladder has no means of escaping
  but that of jumping down.

Jumpers.  Persons who rob houses by getting in at the windows. 
  Also a set of Methodists established in South
  Wales.

Juniper lecture.  A round scolding bout.

Jury leg.  A wooden leg:  allusion to a jury mast, which
  is a temporary substitute for a mast carried away by a
  storm, or any other accident.  Sea phrase.