water hammer

• POS: Noun Phrase
• HYPHEN: wa=ter ham=mer

CIDE DICTIONARY

water hammer,  

•  A vessel partly filled with water, exhausted of air, and hermetically sealed. When reversed or shaken, the water being unimpeded by air, strikes the sides in solid mass with a sound like that of a hammer.  [1913 Webster]
•  A concussion, or blow, made by water in striking, as against the sides of a pipe or vessel containing it.  [1913 Webster]
•  A metal hammer used when heated, as by dipping in hot water, to blister the skin, as for counterritation.  [Webster 1913 Suppl.]