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English definition of “litmus test”

litmus test

noun [C ] uk   us  
a test to find out if a substance is acid or alkaline [usually singular] someone's decision or opinion about something that suggests what they think about a wider range of related things: The president's policy on abortion is regarded as a litmus test of his views on women's rights.
(Definition of litmus test from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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