jounce /ˈʤaʊn(t)s/
  (vt.)(vi.)(使)震動,搖撼,(使)顛簸搖動,震動
  Jounce v. t. & i. [imp. & p. p. Jounced p. pr. & vb. n. Jouncing ]  To jolt; to shake, especially by rough riding or by driving over obstructions.
  Jounce, n. A jolt; a shake; a hard trot.
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  jounce
       n : a sudden impact; "the door closed with a jolt" [syn: jolt,
            jar]
       v : move up and down repeatedly [syn: bounce]