Sonic underground Synonyms

Definitions for Sonic


  • (adjective) (of speed) having or caused by speed approximately equal to that of sound in air at sea level
  • (adjective) relating to audible sound

Synonyms for phrase

SU abbreviation

SU is an abbreviation for Sonic Underground
What does SU stand for?
SU stands for "Sonic 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