tunnel
US /ˈtʌnəl/
・UK /'tʌnl/
B1
adjective
- As if looking in a long hole
noun
- Passage under the ground, often for cars or trains
- An underground passageway, especially one for trains or cars.
verb
- To dig a hole from one side to another
other
- To make a tunnel.
other
- To dig a tunnel through something.
Examples
They've built a new tunnel through the mountain. The initial section of tunnel had to be dug by hand.
a wind tunnel for aerodynamic experiments