1. a way of deciding whether something is successful or true
   • ● The acid test of a good driver is whether they remain calm in an emergency.
   • ● The perception of fairness is the acid test for democracy.
   • ● This type of stone is the acid test of a climber’s ability.
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   Word Originfiguratively, from the original use which was a test for gold using nitric acid.

[TahlilGaran] English Dictionary ▲

a test where the conclusions are beyond doubt
The problem was an acid test of our faith in the manager.

[TahlilGaran] English Idioms Dictionary ▲