Definition of jack jumper
: a sled that consists of one thick runner curved much like a barrel stave to which is attached an upright with a seat having grips on either side of its undersurface and that is used on a slope
also
: a person who rides a jack jumper
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“Jack jumper.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/jack%20jumper. Accessed 22 Apr. 2021.
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