"tunnel" in the noun sense
1. tunnel
a passageway through or under something, usually underground (especially one for trains or cars
"the tunnel reduced congestion at that intersection"
2. burrow, tunnel
a hole made by an animal, usually for shelter
"tunnel" in the verb sense
1. burrow, tunnel
move through by or as by digging
"burrow through the forest"
2. tunnel
force a way through
Source: WordNet® (An amazing lexical database of English)
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