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litmus test

noun [C usually singular]
 
 

Definition

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.Signs, signals and symbolsSpecific signs and symbols
(Definition of litmus test noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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