wheel + horse; from analogy with the horse that did the bulk of work in a team.
"wheelhorse." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/wheelhorse>.
wheelhorse. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/wheelhorse
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