| 1. | Also called underground railway. a railroad running through a continuous tunnel, as under city streets; subway. |
| 2. | (often initial capital letters ) U.S. History. (before the abolition of slavery) a system for helping fugitive slaves to escape into Canada or other places of safety. |
Un·der·ground Railroad  (ŭn'dər-ground')  n.
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A network of houses and other places that abolitionists used to help slaves escape to freedom in the northern states or in Canada before the Civil War. The escaped slaves traveled from one “station” of the railroad to the next under cover of night. Harriet Tubman was the most prominent “conductor” on the Underground Railroad.
underground railroad
A secret network for moving and housing fugitives, as in There's definitely an underground railroad helping women escape abusive husbands. This term, dating from the first half of the 1800s, alludes to the network that secretly transported runaway slaves through the northern states to Canada. It was revived more than a century later for similar escape routes.