an acid test

a test which will really prove the value, quality, or truth of something The new show was well received but viewing figures for the next episode will be the real acid test. The acid test for the product will be whether people actually buy it.

Common Names:

Name	Pronounced	Usage
Sappho	SAF-o (English)	Ancient Greek
Hebe	HEE-bee (English)	Greek Mythology
Iphigenia	-	Greek Mythology (Latinized)
Geretrudis	-	Ancient Germanic (Latinized)
Dushyant	-	Indian, Hindi
EgÍDio	-	Portuguese