1885, in the meaning defined above
“Side horse.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/side%20horse. Accessed 7 Dec. 2023.
Britannica.com: Encyclopedia article about side horse
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
See Definitions and Examples »
Get Word of the Day daily email!