underground, n.
(undergrounds)
(undergrounds)
an electric railway operating below the surface of the ground (usually in a city)
<noun.artifact> freq. cnt.: 4 freq. cnt.: 3 freq. cnt.: 1
metro subway subway system tube underground
sample sentences
"in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
semantic pointers
hypernym
a secret group organized to overthrow a government or occupation force
<noun.group>
resistance underground
lexical pointers
derivationally related form