Jailhouse-lawyer meaning

A prison or jail inmate who is self-taught about the law and offers information to other inmates, especially to assist them in cases in which they are defending themselves.
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(slang) A prison inmate who has learned enough about legal procedures while incarcerated to seek release or sentence reduction and, often, to counsel other inmates in doing so.
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(informal) A person incarcerated in a prison, jail, etc who has acquired significant knowledge of the justice system and who is able to represent himself in some legal proceedings and to provide legal advice to other prisoners.
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