order arms

  1. to bring the rifle to an upright position with its butt on the ground beside the right foot, and remain at attention
  2. a command to do this

See order arms in American Heritage Dictionary 4

noun
  1. A position in the military manual of arms in which the rifle is held vertically next to the right leg with its butt resting on the ground.
  2. A command to assume order arms.
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