1. Situé sous terre. Passage souterrain.
2. Secret. Intrigues souterraines.
ETYM Latin subterraneus; sub under + terra earth. Related to Terrace.
1. Being or operating under the surface of the earth.
2. Lying beneath what is revealed or avowed, especially being deliberately concealed; SYN. ulterior.
1. Being below the surface of the ground
2. Done or occurring out of sight; secret; clandestine.
Galerie sous terre.