Definitions for underground railroad
Random House Webster's College Dictionary
(often caps.) (before the abolition of slavery in the U.S.) a system for helping fugitive slaves escape into Canada and other places of safety.
Category: American History
Origin of underground railroad:
Underground Railroad, Underground Railway(noun)
secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War
The Pre-American Civil War anti-slavery resistance movement dedicated to assisting escaped slaves in reaching safe territory.
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