n.
1.a passageway through or under something, usually underground (especially one for trains or cars)
2.a hole in the ground made by an animal for shelter tunnel v.
1.move through by or as by digging
2.force a way through
Idiom of the Day
sign one's own death warrant
to do something knowingly that will probably result in severe trouble
Our secretary signed her own death warrant when she came to work late three times last week.