shave rule
 n.— «Add the fact that curveballs aren’t allowed, with a few exceptions for more developed pitchers, who fit what is called the shave rule, meaning that a youngster is generally physically developed enough to safely throw curves when they begin to shave, and there’s a declined risk of the injury.» —“Ted Williams Baseball League finds way around Little League Elbow” by WIlliam Wassersug Wicked Local (Cohasset, Massachusetts) Mar. 27, 2009. (source: Double-Tongued Dictionary)

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