chatter bump
 n.— «The bump course is used primarily for suspension and structural durability evaluation. It has four test sections consisting of resonance bumps, impact bumps, chatter bumps and inverted chuck holes.» —“TRC Draws the Auto World to Central Ohio” by Robert T. Host in East Liberty, Ohio Columbus Business Journal (Ohio) Nov. 1, 1986. (source: Double-Tongued Dictionary)

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