Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: clarion type of trumpet (used for battle signals) 1300-1400 Medieval Latin clario, from Latin clarus; CLEAR1

clarion call

 noun
     
clar‧i‧on call [countable] formal
a strong and direct request for people to do something:
This election is a clarion call for our country to face the challenges ahead.
Definition from the Longman Dictionary of Contemporary English
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