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The Idiom Attic - a collection of hundreds of English idioms, each one explained.

The meaning of "the acid test"

" The acid test "
1. A scientific test to distinguish between gold and base metals. 2. A conclusive test to determine the validity of a claim.
1. We found a mineral that looked valuable but it might be fools gold - we need to give it the acid test. 2. The acid test of the quality of a singer is to ask them to sing unaccompanied.
Where did it originate?:
USA, mid-19th century.
Where is it used?:
Hear the idiom spoken:
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