Underground machinery 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 Machinery


  • (noun) something used to achieve an end
  • (noun) machines or machine systems collectively
  • (noun) a system of means and activities whereby a social institution functions