As I suspected - complete and utter nonsense definition. You've just made your own decision on what a word means. Even by that nonsense, that exactly what Trent did several times in the game. More to the point - it was a valid and effective tactic making good use of a strength of Liverpool players whilst bypassing a strength of Arsenal (midfield).
Definition from Wiki for clarity:
"In association football, a long ball is an attempt to move the ball a long distance down the field via one long aerial kick from either a goalkeeper or a defender directly to an attacking player, with the ball generally bypassing the midfield."
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