v. t. & i. [ imp. & p. p. Jounced p. pr. & vb. n. Jouncing ] [ Cf. Jaunce. ] To jolt; to shake, especially by rough riding or by driving over obstructions. [ 1913 Webster ]
(n) a sudden jarring impact, Syn. shock, jar, jounce, Example:the door closed with a jolt; all the jars and jolts were smoothed out by the shock absorbers