I.
noun ( BrE ) ⇨ See also ↑ subway
VERB + UNDERGROUND
▪ go by , go on , take , travel by , travel on
▪
We went by ~.
▪
I often travel on the ~.
UNDERGROUND + NOUN
▪ station , train , tunnel
▪ system
▪
It brought the whole ~ system to a halt.
PREPOSITION
▪ in the ~
▪
I always seem to get lost in the ~.
▪ on the ~
▪
passengers on the ~
II.
adj.
Underground is used with these nouns: ↑ cable , ↑ cave , ↑ cellar , ↑ chamber , ↑ culture , ↑ economy , ↑ garage , ↑ laboratory , ↑ line , ↑ map , ↑ mine , ↑ music , ↑ parking , ↑ passage , ↑ passenger , ↑ pipe , ↑ reservoir , ↑ river , ↑ scene , ↑ service , ↑ shelter , ↑ spring , ↑ station , ↑ stream , ↑ train , ↑ tunnel , ↑ vault
III.
adv.
Underground is used with these verbs: ↑ bury