This is the 8497th most frequent Dutch word.
hek
Fence.
In this sentence, 'hek' is used to refer to a physical barrier or fence.
Ik leunde tegen het hek terwijl ik wachtte.
I leaned against the fence while waiting.
In this idiomatic expression, 'hek' metaphorically refers to a barrier, meaning 'all restrictions are removed.'
Na het ongeluk was het hek van de dam.
After the accident, all control was lost.
Here, 'hek' is used to describe a gate or barrier marking an entrance.