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Wiktionary
long ball

n. (context football English) A kick in which the ball is kicked over the heads of other players into an empty space, into which an attacker is moving.

Wikipedia
Long ball

In association football (soccer), a long ball is an attempt to move the ball a long distance down the field via a cross, without the intention to pass it to the feet of the receiving player. In Continental Europe the style is called kick and rush. It is a technique that can be especially effective for a team with either fast or tall strikers. The long ball technique is also a through pass from distance in an effort to get the ball by the defensive line and create a foot race between striker and defender. While often derided as either boring or primitive, it can prove effective where players or weather conditions suit this style; in particular, it is an effective counter-attacking style of play in which some defenders can be caught off-guard.