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English definition of “clarion call”

clarion call

noun [C usually singular] uk   /ˈklær.i.ənˌkɔːl/ us    /ˈkler.i.ənˌkɑːl/ literary
a very clear message or instruction about what action is needed: to issue/sound a clarion call for changeInstructions and orders
(Definition of clarion call from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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