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Oaks
One of the five ‘classics’ of the flat season in the UK for three-year-old fillies.

Objection
This is where a jockey or trainer objects to the conduct of a participant in a race and an investigation is carried out.

Odds
Also the ‘price’ or ‘line’. The probability of a selection(s) winning a selected event. Can be expressed as fractions (e.g., 6/4) or decimals (e.g., 2.50).

Odds against
Where the odds are greater than evens (e.g., 2/1). This refers to a price where you have to stake less than the amount you expect to make as profit.

Odds on
Where the odds are below evens (e.g., 1/2). This refers to a price where you have to stake more than the amount you expect to make as profit.

Off
The ‘off’ of a race is the point at which the race begins.

Off the bridle off the bit
This is when the horse has to be urged on by its jockey.

Off the top
This is the practice of deducting a fixed ‘take’ percentage from the pari-mutuel pool before paying holders of winning tickets.

Off track
This is betting activity conducted away from the track.

On the bridle on the bit
A horse going well within himself, still having a grip on the bit.

On the nose
To back a selection to win only.

One paced
This is a horse that cannot produce the extra pace required and just keeps on at the same speed.

Outsiders
This is the opposite to the favourite, usually to be found at lengthy odds.

Over broke
This is where the ‘book’ results in a loss for the bookmaker, i.e., an arbitrage situation where a punter can back all the selections and still make a profit.

Over round
This is profit margin in the bookmaker's favour. Punters cannot back each selection and make a profit on an over-round book.

Overlay
This is a horse whose odds are high by comparison with its good winning chances.