U
- Unbackable: A horse which is quoted at such extremely short odds that investors decide it is too short to return a reasonable profit for the risk involved.
- Under double wraps: An expression indicating that a horse won very easily without being fully extended.
- Unders: Odds about a horse which are considered to be bad value because they are shorter than its estimated winning probability.
- Undertaker: A bookmaker said to only be interested in laying "dead 'uns".
- Urger: see coat-tugger.
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