This is the 1500th most frequent Turkish word.
engellemek
To block, prevent, or hinder.
'engelledi' is used to describe a physical obstruction caused by an event.
Trafik kazası yolu engelledi.
The traffic accident blocked the road.
Here, 'engel' (a noun form of 'engellemek') refers to a metaphorical barrier.
Bu engeli aşmanın yollarını düşündüm.
I thought about ways to overcome this obstacle.
'engellenmişti' indicates an impediment caused by a technological issue.