This is the 919th most frequent Polish word.
lasu
"Lasu" means "of the forest" in English.
In this sentence, the word 'lasu' is in the genitive singular form used to express direction towards a location.
Chodzę często do lasu na spacery.
I often walk into the forest for walks.
Here, 'lasu' is in the genitive form indicating the origin from which something is taken.
Zbieram jagody z lasu.
I am picking blueberries from the forest.
In this usage, 'lasu' is in the genitive case describing the pathway's direction.