This is the 4678th most frequent German word.
verlängern
To extend or prolong.
Here, 'verlängern' means to extend the duration of something, specifically the vacation.
Ich möchte meinen Urlaub verlängern.
I want to extend my vacation.
In this sentence, 'verlängern' is used to describe the physical extension of an object, the tunnel.
Der Tunnel wurde um zwei Kilometer verlängert.
The tunnel was extended by two kilometers.
Here, 'verlängern' is utilized in the context of extending the validity period of a permission or document.