In baseball, a line drive is a type of batted ball, sharply hit, and on (or slightly above) a level trajectory. The threshold between a line drive (also sometimes called a liner or frozen rope) and a fly ball can be subjective.
Line drives can be dangerous to baseball players and spectators. For example, on July 22, 2007, Tulsa Drillers first base coach Mike Coolbaugh was killed in a line drive accident at an away game with the Arkansas Travelers. Though the ball hit his neck, his death was the impetus for base coaches to start wearing helmets. 
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