This is the 5422nd most frequent Swedish word.
fastnar
"Fastnar" means "gets stuck" or "adheres."
The word 'fastnar' here means 'to get stuck' in a metaphorical sense, implying an inability to progress beyond a particular idea.
Jag fastnar ofta på samma idé.
I often get stuck on the same idea.
In this sentence, 'fastnar' refers to the act of getting physically stuck, describing a tangible scenario where hair physically attaches to the brush.
Mitt hår fastnar i borsten.
My hair gets caught in the brush.
Here, 'fastnar' is used to describe a physical situation where the car cannot move because it is trapped in the snow.