Wiktionary
reinsman
n. (context horseriding English) A (male) jockey, especially in harness racing
Usage examples of "reinsman".
Leo Hofeller of Butler, Pennsylvania, and being driven by professional reinsman Roy Moyer.
Trojans scattered in panic, bolting left and right while the fighting son of Atreus led Odysseus through the onslaught, bracing him with an arm till a reinsman drove his team and car up close.