Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun underground_railroad

1 sense of underground railroad

Sense 1
Underground Railroad, Underground Railway -- (secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War)
       INSTANCE OF=> escape, flight -- (the act of escaping physically; "he made his escape from the mental hospital"; "the canary escaped from its cage"; "his flight was an indication of his guilt")