Definition of long ball:
(n) :
(baseball) A home run
(n) :
(soccer) A kick in which the ball is kicked over the heads of other players into an empty space, into which an attacker is moving.
(n) :
(soccer, usually attributive) A strategy focused on sending the ball upfield directly to the striker, especially one with few other tactical innovations.
(n) :
(basketball) A three-point shot.