racehorses is a form of:

Ringleader



noun
1.
(A person who leads others, in a mutiny, riot, crime, etc., a leader in any sort of mischief) មេ, មេក្រុម, មេដឹកនាំ, ប្រធាន
Example: Samai is always the ringleader when any mischief is afoot.
ENGLISH MEANING
noun
1.
The leader of a circle of dancers; hence, the leader of a number of persons acting together; the leader of a herd of animals.
2.
Opprobriously, a leader of a body of men engaged in the violation of law or in an illegal enterprise, as rioters, mutineers, or the like.