Definition of tour de force noun from the Oxford Advanced Learner's Dictionary

 

tour de force

 noun
noun
BrE BrE//ˌtʊə də ˈfɔːs//
 
; NAmE NAmE//ˌtʊr də ˈfɔːrs//
 
(pl. tours de force
BrE BrE//ˌtʊə də ˈfɔːs//
 
; NAmE NAmE//ˌtʊr də ˈfɔːrs//
 
)
(from French)
 
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an extremely skilful performance or achievement a cinematic tour de force It was described as a ‘literary tour de force’. Word OriginFrench, literally ‘feat of strength’.
See the Oxford Advanced American Dictionary entry: tour de force