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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Sports A fault against the server, as in tennis, called for failure to keep both feet behind the base line.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A fault where the server's foot is placed within the court or on the wrong half of the baseline, prior to the ball being hit, resulting in a foul serve.


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