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)
Further reading
Some people work hard to lose their accent in order to fit in. Others may be homesick for the voices they grew up with and try to reclaim them. How can you regain your old accent? Also, a compelling book about scientific taxonomy shows how humans...
In Enough is Enuf: Our Failed Attempts to Make English Easier to Spell (Bookshop|Amazon), Gabe Henry recounts the story of the first national spelling bee in 1908, which some contestants had threatened to boycott because one of the contestants from...