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tunnel
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
.