From Longman Dictionary of Contemporary Englishtour de forcetour de force /ˌtʊə də ˈfɔːs $ ˌtʊr də ˈfɔːrs/ noun [singular] written IMPRESSsomething that is done very skilfully and successfully, and is very impressive His speech to the Democratic Convention was a tour de force.
Examples from the Corpus
tour de force• King's unaccompanied solo on Lush Life is an improvisational tour de force.• Hartman's new novel is a literary tour de force.• So far, in a major tour de force, the implications have been ignored.• This was Abba's tour de force, a brilliantly structured melodrama which put Faltskog's fragile, emotional vocal centre stage.• Still, Freedman's tour de force of a final chapter is his most persuasive.Origin tour de force (1800-1900) French “impressive act of strength” 