jounce

verb (used with or without object), jounced, jounc·ing.

1. to move joltingly or roughly up and down; bounce.

noun

2. a jouncing movement.

verb

1. to shake or jolt or cause to shake or jolt; bounce

noun

2. a jolting movement; shake; bump

v.

mid-15c., of unknown origin, perhaps a blend of jump and bounce. Related: Jounced; jouncing. The noun is 1787, from the verb.