(rail transport) rapid transit, metro, (AmE) subway, (BrE) underground

(history) a common courtier (a courtier who didn't get access to the imperial palace)

underground; subterranean

to run; to move at a high speed / to appear briefly; to flash / to give over oneself to; to commit oneself to (usually something bad) / (music) Alternative spelling of ハシる

race; run

run

(rail transport) rapid transit, metro; (AmE) subway; (BrE) underground; (BrE) tube (abbr. 地下鉄)

the London Underground

underground line, specifically an underground cable or wire

basement, cellar (floor below ground level)