fire in the belly
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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.
fire in the (or your) bellya powerful sense of ambition or determination.
1991 Vanity Fair Bennett is quick to deny feeling the fire in the belly generally considered a prerequisite for tenancy at 1600 Pennsylvania Avenue.