un'derground rail'road

1. Also called un'derground rail'way. a railroad running through a continuous tunnel, as under city streets; subway.
2. (often caps.) U.S. Hist.(before the abolition of slavery) a system for helping fugitive slaves to escape into Canada or other places of safety.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

underground movieundergrown
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