water hammer

/W AO1 T ER0 HH AE1 M ER0/
noun
  1. 1

    A surge of pressure in a pipe carrying a fluid; especially the banging sound in a steam or hot water pipe caused by bubbles of air, or by an abrupt alteration of the flow.

  2. 2

    A metal hammer used when heated, as by dipping in hot water, to blister the skin, as for counterirritation.

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Source: https://en.wiktionary.org/wiki/water%20hammer