chatter bump
 n.— «Buick’s big Air Cushion Tires smooth away road irregularities; swallow the chatter-bumps, just as Knee-Action Wheels absorb the big jars and bumps.» —“Your New Car Must Have All For of These Features” in advert. Wall Street Journal (16) Jan. 8, 1934. (source: Double-Tongued Dictionary)

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