rallying cry

rallying cry (plural rallying cries)

1. A form of war cry that encourages people to unite in a common cause
   • 2021 September 22, Caroline Siede, “Dear Evan Hansen is a misfire on just about every level”, in AV Club‎:

     Soon enough, Evan is faking elaborate email correspondence between himself and Connor, and turning his fake grief into viral fame with a memorial speech that becomes an internet rallying cry for mental health and suicide prevention.

• “rallying cry”, in Collins English Dictionary.
• “rallying cry”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “rallying cry” in Longman Dictionary of Contemporary English, Longman.