A competitive race for horses carrying jockeys; often the subject of betting / An exciting and arduous competition (as in a political campaign).

a child’s toy consisting of a (usually wooden) horse mounted on a rocker or swing

Alectis indica (Indian threadfish) / Atule (certain scads) / Caranx spp. (certain trevallies) / Carangoides spp. (island jacks) / Gnathanodon speciosus (golden trevally)

(idiomatic, US) A muscle cramp, usually in the thigh or leg.

An apparatus for gymnastic exercises with a cylindrical body covered with leather and two upright pommels, as hand grips, near the centre; held upright with adjustable legs.

(gymnastics) An apparatus with an upholstered body but no pommels; since about 2000 replaced with vault, also called vaulting table.

Alternative form of horse hockey

(dated, nautical) The period of work on board ship for which the seamen have been paid in advance (usually a month's wages), the end of this term being celebrated by parading a straw horse about the decks.

(Greek mythology) The hollow wooden horse by which the Greeks allegedly gained access to Ilium/Troy during the Trojan War.

(by extension) A subversive person or device placed within the ranks of the enemy. / (computer security) A malicious program that is disguised as legitimate software.