sleeping policeman

• Audio (General Australian):

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sleeping policeman (plural sleeping policemen)

1. (British and Caribbean English, idiomatic) A speed bump.
   • 2000 July 5, William Weir, “They're looking up 'Yankspeak' for the Oxford English Dictionary”, in CNN.com, retrieved 18 September 2007:

     We don't care much to figure out terms like "brolly" (umbrella) and "sleeping policeman" (speed bump).

• silent policeman