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acid test in French

acid test in French

épreuve du feu
noun
(figuratively) A rigorous test or appraisal of the quality or worth of something.
épreuve par le feu
noun
(figuratively) A rigorous test or appraisal of the quality or worth of something.
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Translations from WikDict, CC BY-SA · example sentences from Tatoeba, CC BY 2.0 FR.