be on the bum

be on the bum

To not be working correctly or properly; to be out of order; broken. My car has been on the bum ever since I let my brother borrow it for the weekend. I think our washing machine is on the bum—these clothes are all sopping wet and don't smell clean!
See also: bum, on
Farlex Dictionary of Idioms.
See also:
  • on the bum
  • bum (something)
  • bumming
  • bum something
  • bum
  • bummed
  • bum something off someone
  • bum (something) off (someone)
  • bum off
  • beach bum