jounce
verb
definition 1: to move or be moved jerkily and unevenly; bounce.
example: The car jounced over a particularly rough piece of road.
noun*
a jerky and uneven movement; bounce.
*quotation:
The Rabbit knew of a dragon-fly who was strong in his feelers; but the Large Doll had an objection to dragon-flies, so she flung herself in with a jounce, and that closed her eyes. Old-Fashioned Tales