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From The Collaborative International Dictionary of English v.0.48:
Jolt \Jolt\ (j[=o]lt), v. i. [imp. & p. p. Jolted; p. pr. &
vb. n. Jolting.] [Prob. fr. jole, joll, jowl, and orig.
meaning, to knock on the head. See Jowl.]
To shake with short, abrupt risings and fallings, as a
carriage moving on rough ground; as, the coach jolts.