This is the 10132nd most frequent Polish word.
blizn
"Blizn" is the genitive plural form of "blizna," meaning "scars" in English.
The word 'blizn' refers here to physical scars on a person's skin, in the plural form and genitive case.
Na jego twarzy widniało wiele blizn.
On his face, there were many scars.
The word 'blizn' is used metaphorically here, referring to emotional marks or wounds, again in the plural form and genitive case.
Opowiadanie pełne jest emocjonalnych blizn.
The story is full of emotional scars.
In this sentence, 'blizn' again refers to physical scars and is in the genitive case to describe the quantity of scars persisting.