A "rallying cry" is a statement or slogan used to motivate and inspire a group of people to come together and achieve a common goal. It is like a powerful call to action that brings people together and spurs them into action. Full definition
Over the past couple of years there's been a growing rally cry in support of failure. (rolereboot.org)
As always they ignore the cause and source for real examination and promote a «men are all violent to kids and mothers too» rally cry from the opposition. (thelizlibrary.org)
My wife and I now own a dance studio and employ nine teachers, this will be my new rally cry. (gapingvoid.com)