Underground outside 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

UO abbreviation

UO is an abbreviation for Underground Outside

What does UO stand for?

UO stands for "Underground Outside"

Definitions for Outside

(adjective) situated on the outside or farther out
(adjective) small in degree
(adjective) of the greatest or highest degree or quantity