acid test
n.
A decisive or critical test, as of worth or quality.
[From the testing of gold in nitric acid.]
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A decisive or critical test, as of worth or quality.
[From the testing of gold in nitric acid.]
The most severe test of reliability. Since gold resists acids that corrode other metals, the acid test was used for metals purporting to be gold. See Quick Ratio.
A decisive trial to determine worth or quality, as in Exposure to brilliant sunlight is the acid test for showing this fabric won't fade. Alluding to a 19th-century chemical test for distinguishing gold from other metals, this term was used figuratively by the
early 1900s.
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