ˈjump ball noun [countable]
the act of throwing the ball up in a game of basketball, so that one player from each team can try to gain control of it

[TahlilGaran] Dictionary of Contemporary English ▲

jump ball
n. The starting of play in basketball by tossing the ball into the air between two opposing players, each of whom jumps and tries to hit the ball to a member of his own team.
Two players held onto the ball at the same time and the referee called a jump ball.

[TahlilGaran] English Idioms Dictionary ▲