A solid or hollow sphere, or roughly spherical mass.
“a ball of spittle; a fecal ball”
A round or ellipsoidal object.
verb
To form or wind into a ball.
“to ball cotton”
To heat in a furnace and form into balls for rolling.
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.