trampoline effect
 n.— «Wood bat advocates are concerned that balls hit off metal bats are subject to what is known as a trampoline effect: When a ball hits a wooden bat, the ball compresses at the instant of impact and loses much of its energy. With a metal bat, the barrel is compressed by the ball. The bat can act like a spring or trampoline in driving the ball, which loses less energy.» —“Dealing with a batty situation: Wood vs. metal” by Jack Carey USA Today June 3, 2007. (source: Double-Tongued Dictionary)

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