Jounce (jouns), v. t. & i. [imp. & p. p. Jounced (jounst); p. pr. & vb. n. Jouncing (joun"sĭng).] [Cf. Jaunce.] To jolt; to shake, especially by rough riding or by driving over obstructions.
Jounce, n. A jolt; a shake; a hard trot.