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
throw caution to the wind
to become very careless
I will throw caution to the wind and tell my boss about my complaints about the company.