Tour-de-force meaning

to͝or də fôrs
A feat requiring great virtuosity or strength, often deliberately undertaken for its difficulty.
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An unusually skillful or ingenious creation, production, or performance, sometimes one that is merely clever or spectacular.
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A feat demonstrating brilliance or mastery in a field.

Now orbiting Earth, Gravity Probe B is a technological tour de force.

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An outstanding display of skill.
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Origin of tour-de-force

  • French tour turn, feat de of force strength

    From American Heritage Dictionary of the English Language, 5th Edition

  • French “feat of strength" circa 19th century.

    From Wiktionary