1. up and down movement, jolting movement, bounce, bump. move up and down, bounce, jolt, bump. jouncejounce , 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.jounce jounce, n. a jolt; a shake; a hard trot.jounce a sudden impact; the door closed with a jolt [syn: jolt, jar] move up and down repeatedly [syn: bounce]