Definition of intestinal fortitude noun from the Oxford Advanced Learner's Dictionary

 

intestinal fortitude

 noun
noun
BrE
 
; NAmE
 
(North American English, 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 American Dictionary entry: intestinal fortitude