(interjection) :
an appeal by the crowd for
holding the ball against a tackled player. This is heard almost any time an opposition player is tackled, without regard to whether the rules about "prior opportunity" to dispose of the ball are fulfilled
"2007: A good tackle (and some bad ones) will bring a cry of "Ball!" from the crowd - a plea for a holding the ball free kick. — AFL Sydney Swans Rules Zone"