Umbral underground Synonyms

Synonyms for phrase

UU abbreviation

UU is an abbreviation for Umbral Underground
What does UU stand for?
UU stands for "Umbral Underground"

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