This is the 17967th most frequent Polish word.
ślisko
Slippery.
The word 'ślisko' here is used as an adverb to describe the condition of the road.
Ślisko jest na drodze po deszczu.
It is slippery on the road after rain.
In this sentence, 'ślisko' again serves as an adverb indicating the slippery state of the sidewalk.
Uważaj, bo ślisko się robi na chodniku.
Be careful, because it is becoming slippery on the sidewalk.
Here, the word 'ślisko' describes the frequent winter condition in an adverbial manner emphasizing the general quality of the environment.