Acid-test meaning

A decisive or critical test, as of worth or quality.
noun
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A crucial, final test that proves the value or quality of something.
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(idiomatic) A rigorous test or appraisal of the quality or worth of something.
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Origin of acid-test

  • From the testing of gold in nitric acid

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

  • From the testing of gold with nitric acid (true gold is not affected)

    From Wiktionary