(idiomatic) Alternative form of rocking horse shit

(idiomatic, vulgar, slang) Something exceedingly rare or, more likely, nonexistent.

A horse that draws a coach. / (nautical, slang) A member of the crew who rowed the admiral's barge or a state barge

(UK, Australia, humorous, slang) hors d'oeuvres

Any of various gentle techniques of training or breaking horses. / A purported magical ability enabling one to speak to horses or to have control over horses through whispering.

(literally) The tail of a horse. / (botany) Any of various simple vascular plants, of the order Equisetales, that have hollow stems and produce spores. / (military) A Turkish standard denoting rank.

Alternative spelling of hobby horse

Any member of the species Equus ferus, including the Przewalski's horse and the extinct Equus ferus ferus. / (zoology) Any current or extinct animal of the family Equidae, including zebras and asses.

(intransitive) To frolic, to act mischievously. (Usually followed by "around".) / (transitive) To play mischievous pranks on. / (transitive) To provide with a horse; supply horses for.

(uncountable, slang) Heroin (drug).