fire in your belly

fire in (one's)/the belly

Passion and determination. I'm confident that Bill will get them to listen to our pitch—he has such a fire in the belly for this sort of work.
See also: belly, fire
Farlex Dictionary of Idioms.

fire in your belly

or

fire in the belly

If you have fire in your belly or fire in the belly, you are ready to do something in a very energetic and passionate way. Ian has played with fire in his belly throughout his career. He accused the candidate of lacking fire in the belly. Note: You can also say that someone has a fire in their belly or a fire in the belly. He also has a fire in his belly. `I'm passionate about what I do,' he says.
See also: belly, fire
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • fire in (one's)/the belly
  • fire in the belly
  • airing
  • air (one's) belly
  • air belly
  • air one’s belly
  • bellies
  • belly button
  • have a yellow belly
  • beer belly