Beat it! (SLANG) Go away!
cha ching (slang)
a) a very foolish person (informal,UK)
I felt such a lemon when I discovered I'd missed my appointment.
b) something that does not work (informal, US)
Only one of his inventions turned out to be a lemon.
couldn't act/argue/fight your way out of a paper bag (humorous) if someone couldn't act, argue, fight etc. their way out of a paper bag, they act, argue, fight etc. very badly
Student or Learner