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An act that violates the rules of a sport
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Become soiled and dirty
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Make unclean
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Spot, stain, or pollute
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Make impure
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Commit a foul; break the rules
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Hit a foul ball
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Become or cause to become obstructed
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(of a baseball) not hit between the foul lines
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Disgustingly dirty; filled or smeared with offensive matter
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Characterized by obscenity
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(of a manuscript) defaced with changes
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Offensively malodorous
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Highly offensive; arousing aversion or disgust
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Especially of a ship's lines etc
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Violating accepted standards or rules