Meaning of water hammer | Babel Free

Definitions

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

CEFR level