This is the 5963rd most frequent Polish word.
zza
"Zza" means "from behind" in English.
The word 'zza' specifies the origin of the observation, indicating that the view comes from a position behind the tree.
Widzę cię zza drzewa.
I see you from behind the tree.
Here, 'zza' marks the location the sound originates from, showing it comes from beyond the wall.
Dźwięk dochodzi zza ściany.
The sound is coming from behind the wall.
In this case, 'zza' indicates the point of emergence, which is from a location beyond the corner.