This is the 1536th most frequent Dutch word.
dagje
"Dagje" means "a little day" or "a day out/trip."
Here 'dagje' is used as a diminutive of 'dag' (day), indicating a casual or leisure day.
We hebben een dagje in het park doorgebracht.
We spent a day in the park.
'Dagje' is used to refer to a quick and single day taken from work.
Ik heb een dagje vrij genomen om te ontspannen.
I took a day off to relax.
In this context, 'dagje' suggests a full day outing or visit for leisure.