on your Jack

on (one's) Jack

old-fashioned Alone, abandoned, or isolated; on one's own. Primarily heard in UK. Coming home from the war, many veterans felt as though they were on their Jack as they tried to re-enter civilian life.
See also: jack, on
Farlex Dictionary of Idioms.

on your Jack

on your own. British informal
This an abbreviation of the rhyming slang expression on your Jack Jones .
See also: jack, on
Farlex Partner Idioms Dictionary
See also:
  • (Well,) I'll be durned!
  • a bad quarter of an hour
  • a pile Jack Rice couldn't jump over
  • a roll Jack Rice couldn't jump over
  • What say (one)?
  • What say you?
  • What say?
  • (for) land('s) sake(s) (alive)
  • a bit of crackling
  • a whole team and the dog under the wagon