call to arms
a command to report for active military duty.
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Origin of call to arms
First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for call to arms
I believe that most Americans would welcome a call-to-arms against combat arms from our former presidents.
She held Jarvis's letter in her hand—his call-to-arms letter.Bambi|Marjorie Benton Cooke