This is the 2834th most frequent Dutch word.
vierdaagse
"Vierdaagse" refers to a four-day walking event or march.
Here, 'vierdaagse' is used as a noun to name the famous walking event in the Netherlands.
Ik heb me ingeschreven voor de Nijmeegse Vierdaagse.
I have registered for the Nijmegen Four Days Marches.
In this sentence, 'vierdaagse' is used as an adjective meaning 'four-day' to describe the training sessions.
Tijdens de vierdaagse trainingssessies leerde ik veel nieuwe vaardigheden.
During the four-day training sessions, I learned many new skills.
In this example, 'vierdaagse' refers to a specific four-day event centered around nature, functioning as part of a compound noun.