1. acid test - Noun
2. acid test - Phrase
a rigorous or crucial appraisal
Source: WordNetEverybody I know fails the acid test of friendship. Bill Watterson
Belief in one's identity as a poet or writer prior to the acid test of publication is as naive and harmless as the youthful belief in one's immortality... and the inevitable disillusionment is just as painful. Dan Simmons
To me the acid test was always the crew, and if the crew liked you, you're OK. Ann Rutherford
Every formula of every religion has in this age of reason, to submit to the acid test of reason and universal assent. Mahatma Gandhi
Given there is a Charles II exhibition at Queen's Gallery and many works from a similar era at The National Gallery, the acid test is what can this exhibition offer beyond those two. Source: Internet
Soul work is when you wade into a party full of rowdy drunks and put your meditation skills to the acid test. Source: Internet