The difference between Fire in the belly and Intestinal fortitude
When used as nouns, fire in the belly means the emotional stamina and vigor, passion, or inner drive to achieve something, to take action, etc, whereas intestinal fortitude means guts.
check bellow for the other definitions of Fire in the belly and Intestinal fortitude
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Fire in the belly as a noun (idiomatic):
The emotional stamina and vigor, passion, or inner drive to achieve something, to take action, etc.
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Intestinal fortitude as a noun (humorous):
guts