Vaste prik.

The Dutch phrase 'vaste prik' literally translates to 'fixed prick' or 'regular prick'. In this context, 'prik' refers to a 'jab' or 'prick' as in an injection, and by extension, something that is a sharp, recurring event or a regular occurrence. The word 'vast' means 'fixed' or 'firm'. The combination likely evokes the idea of something that is a predictable and unchangeable part of a routine, much like a scheduled injection or a recurring and unavoidable task.