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intestinal fortitude

Intestinal fortitude is defined as courage and endurance to go on.

(noun)

A marathon runner is an example of someone with intestinal fortitude.

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See intestinal fortitude in Webster's New World College Dictionary

courage and perseverance; grit; pluck: a euphemism for “guts” (see gut, sense )

See intestinal fortitude in American Heritage Dictionary 4

noun
Courage; endurance.

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