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water hammer

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noun
  1. the concussion and accompanying noise that result when a volume of water moving in a pipe suddenly stops or loses momentum.

Origin of water hammer

First recorded in 1795–1805
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for water hammer

water hammer

noun
  1. a sharp concussion produced when the flow of water in a pipe is suddenly blocked
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012