(n.) The war cry, or gathering word, of a Highland clan in Scotland; hence, any rallying cry.

bugle call byword call to arms call-up catch phrase catchword clarion clarion call cliche conscription cry device epigraph epithet exhortation expression fad word go for broke gung ho idiom inscription levy locution mobilization motto muster pet expression phrase rally rallying cry rebel yell recruitment shibboleth tag line trumpet call vogue word war cry war whoop watchword