This is the 13258th most frequent German word.
ausdehnen
To expand or extend.
The word 'ausdehnen' is used to mean 'extend' or 'expand' as in increasing the duration or scope of something, in this case, an adventure.
Wir möchten unser Abenteuer außerhalb der Stadt ausdehnen.
We want to extend our adventure outside the city.
Here, 'ausdehnen' refers to the physical expansion or stretching of an object, demonstrated in the balloon inflating.
Der Ballon begann sich beim Aufblasen deutlich auszudehnen.
The balloon started to expand noticeably when inflated.
In this instance, 'ausdehnen' is applied to the extension of an activity or event, suggesting continuing it into the future—specifically, a discussion extending to the next day.