racehorse noun 2forms 1phrases 1 noun2 •A horse that competes in races.They were bosker horses. Until I went to work for Bill I didn't know how good racehorses are. — 1946 •Any member of certain species of genus Congiopodus. formsracehorses Phrases with racehorse piss like a racehorseTo urinate profusely, especially in reference to a profound need to do so.
