WordReference Random House Unabridged Dictionary of American English © 2025
speed′ bump′, 
  1. Civil Engineeringa rounded ridge built crosswise into the pavement of a road or driveway to force vehicles to slow down.
  • 1970–75

Collins Concise English Dictionary © HarperCollins Publishers::
speed bump, speed hump a raised band across a road, designed to make motorists reduce their speed, esp in built-up areas
Also called: ramp, road hump, (NZ) judder bar
'speed bump' also found in these entries (note: many are not synonyms or translations):
judder bar - ramp - road hump - sleeping policeman - speed ramp

Forum discussions with the word(s) "speed bump" in the title:


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