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| Obstacle |
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Any object that a horse must clear to complete the course in show jumping and the three-day event, such as a fence, gate, or water jump.
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| On the Bit |
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Descriptive of a horse that's being restrained by pressure on the bit.
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| On the Flat |
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Descriptive of training or rounding over ground without obstacles.
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| Oxer |
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A fence with two or more vertical jumps several feet apart.
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