This is the 8333rd most frequent Portuguese word.
túnel
A passage or underground corridor for vehicles, trains, or pedestrians.
Here, the word 'túnel' is used to describe a constructed underground or through passage typically used for transportation.
Entramos no túnel para atravessar a montanha.
We entered the tunnel to cross the mountain.
Here, 'túnel' is used metaphorically to describe a theoretical or imagined passage through time.
O túnel do tempo é um conceito fascinante em ficção científica.
The time tunnel is a fascinating concept in science fiction.
In this sentence, 'túnel' again refers to a transportation passage, emphasizing its role in infrastructure.