sleeping policeman

noun
🔊/ˌsliːpɪŋ pəˈliːsmən/
🔊/ˌsliːpɪŋ pəˈliːsmən/
(British English, informal)
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  1. a speed hump (= a raised area across a road that is put there to make traffic go slower)(设在路上的)减速垄,减速带Topics Transport by car or lorryc2