Definition of intestinal fortitude noun from the Oxford Advanced American Dictionary

 

intestinal fortitude

 noun
noun
 
(formal or humorous)
 
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the courage and determination necessary to do something difficult or unpleasant (used when you want to avoid using the word guts ) He did not have the intestinal fortitude to implement the changes. It's rare to find a politician with the intestinal fortitude to take a controversial stance.
See the Oxford Advanced Learner's Dictionary entry: intestinal fortitude