Meaning 1 ►▼
A basketball game is started by the referee throwing up the ball between two players who try to tap it to a member of their team. It is also used when two opposing players have joint possession of the ball.
The referee called for a jump ball because she could not determine which player controlled the ball.
Meaning 2 ►▼
Control issues: The inability to determine anything.
It is a jump ball. The two proposals are so close.