Definition of Grand Guignol noun from the Oxford Advanced Learner's Dictionary

 

Grand Guignol

 noun
noun
BrE BrE//ˌɡrɒ̃ ɡiːˈnjɒl//
 
; NAmE NAmE//ˌɡrɑːn ɡiːˈnjɔːl//
 
[countable, uncountable](from French, formal)
 
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a dramatic performance which is shocking or unpleasant Word OriginFrench, literally ‘Great Punch’.
See the Oxford Advanced American Dictionary entry: Grand Guignol