a crucial test that proves the value or success of something
un test crucial qui prouve la valeur ou le succès de quelque chose (un test crucial qui prouve la valeur ou le succes de quelque chose)
"The product launch will be the acid test of our new design."
"Le lancement du produit sera le test acide de notre nouveau design." (Le lancement du produit sera le **test acide** de notre nouveau design)
to not trust someone much
to describe exactly what is causing a situation or problem
to make yourself feel brave enough to do something
to win by a very large margin
to be in serious trouble or difficulty
to be responsible for something bad that happens