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tunnel
noun
a
long
,
man-made
passage
that
goes
through
or
under
something
such
as
a
mountain
,
river
,
or
city
so
that
people
or
vehicles
can
travel
through
it
.
•
The
new
highway
tunnel
cuts
straight
through
the
rocky
mountain
,
saving
drivers
almost
an
hour
.
The
new
highway
tunnel
cuts
straight
through
the
rocky
mountain
,
saving
drivers
almost
an
hour
.
•
We
could
hear
our
voices
echo
as
we
walked
inside
the
old
railway
tunnel
.
We
could
hear
our
voices
echo
as
we
walked
inside
the
old
railway
tunnel
.
Borrowed
in
the
late
15th
century
from
Middle
French
“
tonnelle
”,
meaning
a
barrel-shaped
vault
,
later
applied
to
underground
passages
.
noun
a
narrow
passage
that
an
animal
digs
in
the
ground
for
living
,
moving
,
or
storing
food
.
•
A
mole
had
created
a
long
tunnel
beneath
our
vegetable
garden
.
A
mole
had
created
a
long
tunnel
beneath
our
vegetable
garden
.
•
The
rabbit
disappeared
into
a
sandy
tunnel
at
the
base
of
the
hedge
.
The
rabbit
disappeared
into
a
sandy
tunnel
at
the
base
of
the
hedge
.
The
animal
sense
extends
the
earlier
meaning
of
a
man-made
passage
to
natural
passages
dug
by
creatures
.
verb
to
dig
or
bore
a
passage
,
especially
underground
,
through
or
under
something
.
•
Engineers
plan
to
tunnel
beneath
the
river
to
build
the
new
subway
line
.
Engineers
plan
to
tunnel
beneath
the
river
to
build
the
new
subway
line
.
•
During
the
war
,
prisoners
tried
to
tunnel
out
of
the
camp
at
night
.
During
the
war
,
prisoners
tried
to
tunnel
out
of
the
camp
at
night
.
Verb
use
dates
from
the
17th
century
,
formed
from
the
noun
“
tunnel
”
plus
the
verbal
suffix
indicating
action
.
