jounce

a forceful coming together of two things we felt a definite jounce every time the car hit a pothole Synonyms bump, collision, concussion, crash, impingement, jar, jolt, impact, kick, shock, slam, smash, strike, wallopRelated Words blow, buffet, hit, knock, punch, rap, slap, thump; bashing, battering, bludgeoning, clobbering, hammering, lambasting, licking, pounding, pummeling (also pummelling), thrashing; contact, encounter, meeting, touch

1 to make a series of small irregular or violent movements a rickety cart jouncing as it was being pulled over the cobblestoned streets Synonyms agitate, bucket, convulse, jerk, jiggle, joggle, jolt, shake, judder [chiefly British], quake, quiver, shudder, vibrate, wobble (also wabble)Related Words rock, sway, swing; chatter, quaver, shiver, thrill, tremble; twitch; dodder, waver; flicker, fluctuate, flutter, oscillate, undulate, wave; beat, palpitate, pit-a-pat, pitter-patter, pulsate, pulse, throb

2 to make short up-and-down movements her head jounced as the horse began to gallop Synonyms bob, bobble, jog, nod, pump, seesaw, wagRelated Words jerk, jiggle, shake, wiggle, wobble (also wabble); oscillate, rock, sway, swing, undulate; drop, duck