fire in your belly

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