pinched back
A horse forced back due to racing in close quarters.
pinhooker
A person who buys a racehorse with the specific intention of re-selling it at a profit.
place
Second position at finish.
place bet
Wager on a horse to finish first or second.
placing judge
Official who posts the order of finish in a race.
plate(s)
1) A prize for a winner. Usually less valuable than a cup. 2) Generic term for lightweight (usually) aluminum horseshoes used during a race.