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half pipe UK US noun [countable] [singular half pipe plural half pipes]

a smooth open surface that is shaped like a ‘U’ and made of concrete or snow that people use in skateboarding , rollerblading , or snowboarding http://www.macmillandictionary.com/med2cd/weblinks/half-pipe.htm

Thesaurus: skating and sports played on ice_hyponym sports events and competitions_hyponym