build a fire under (someone or something)

build a fire under (someone or something)

To motivate someone or something to take action. The deadline really built a fire under us—we never would have gotten all that work done otherwise. Something must have built a fire under Jenna—she has really started taking her schoolwork seriously.
See also: build, fire
Farlex Dictionary of Idioms.
See also:
  • start a fire under (someone or something)
  • light a fire under
  • light a fire under (someone or something)
  • light a fire under someone
  • keep after
  • keep after (someone or something)
  • put a bomb under
  • put a bomb under (someone or something)
  • put a bomb under something
  • put a rocket under (someone or something)