Underground tube Synonyms

Definitions for Underground


  • (adjective) undertaken or done so as to escape being observed or known by others
  • (adjective) being, situated, or operating beneath the surface of the earth
  • (noun) a secret organization in a conquered country fighting against enemy forces

Definitions for Tube


  • (noun) a long hollow cylinder for carrying a substance (as a liquid or gas)
  • (noun) an electronic device with a screen and speakers that reproduces images and sound
  • (noun) a hollow cylindrical shape