pile driver

noun
1.
a machine for driving piles, usually composed of a tall framework in which either a weight is raised and dropped on a pile head or in which a steam hammer drives the pile.
2.
a person who operates such a machine.
3.
a person who hits or attacks forcefully or powerfully.
4.
Wrestling. a move whereby an opponent is turned upside down and slammed headfirst to the mat.
5.
British Sports. a powerful stroke, hit, kick, etc.

Origin:
1765–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
pile driver

noun
a machine that drives piling into the ground 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
If longer piles are needed, a much heavier pile driver can be brought to some sites on a barge.
Pile driver leads shall be constructed in such a manner as to afford freedom of movement of the hammer.
Employees should stand clear of the pile driver as the pile is raised into the leads.
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