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Meaning of guardhouse lawyer

guard'house law'yer

Pronunciation: [key]
— Mil. Slang. Mil. Slang.
  1. a person in military service, esp. an inmate of a guardhouse or brig, who is or claims to be an authority on military law, regulations, and soldiers' rights.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.