Underground siren 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

US abbreviation

US is an abbreviation for Underground Siren

What does US stand for?

US stands for "Underground Siren"

Definitions for Siren

(noun) a woman whom men find irresistibly attractive
(noun) a warning signal that is a loud wailing sound
(noun) an acoustic device producing a loud often wailing sound as a signal or warning