underground
English Dictionary
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Letter U
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underground Definition
(n)
a
secret
group
organized
to
overthrow
a
government
or
occupation
force
(n)
electric
underground
railway
(r)
in
or
into
hiding
or
secret
operation
; "
the
organization
was
driven
underground
"
(r)
beneath
the
surface
of
the
earth
; "
water
flowing
underground
"
(s)
under
the
level
of
the
ground
; "
belowground
storage
areas
"; "
underground
caverns
"
(s)
conducted
with
or
marked
by
hidden
aims
or
methods
; "
clandestine
intelligence
operations
"; "
cloak
-
and
-
dagger
activities
behind
enemy
lines
"; "
hole
-
and
-
corner
intrigue
"; "
secret
missions
"; "
a
secret
agent
"; "
secret
sales
of
arms
"; "
surreptitious
mobilizati
(s)
used
of
independent
armed
resistance
forces
; "
guerrilla
warfare
"; "
partisan
forces
"
underground Synonyms
belowground
clandestine
cloak-and-dagger
guerilla(a)
guerrilla(a)
hole-and-corner(a)
hugger-mugger
hush-hush
irregular
metro
on the quiet(p)
resistance
secret
subway
surreptitious
tube
undercover
underground
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