battering ram

  1. an ancient military machine having a heavy wooden beam, sometimes with an iron ram's head at its end, for battering down gates, walls, doors, etc.
  2. any bar, log, etc. used like this to force entrance

See battering ram in American Heritage Dictionary 4

noun
  1. A very heavy metal bar used by firefighters and law enforcement officers to break down walls and doors.
  2. A heavy beam used in ancient and medieval warfare to batter down the walls and gates of a place under siege.

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battering ram

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