battering ram

noun
1.
an ancient military device with a heavy horizontal ram for battering down walls, gates, etc.
2.
any of various similar devices, usually machine-powered, used in demolition, by police and firefighters to force entrance to a building, etc.

Origin:
1605–15

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
battering ram
 
n
(esp formerly) a large beam used to break down the walls or doors of fortifications

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Neo tears the sign from the ground and wields it as a kendo sword, vaulting
  pole, and battering ram.
Clearly, a danger lurks in the use of investigations as a political battering
  ram.
Using your head as a battering ram may cause brain damage.
The narcotics team had already opened the door with a battering ram.
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