This is the 10856th most frequent Polish word.
dębów
"Dębów" means "oaks" in English.
Here, 'dębów' is the genitive plural form of 'dąb', indicating possession or quantity related to many oak trees.
W lesie rosło wiele starych dębów.
In the forest grew many old oaks.
In this case, 'dębów' is used in the genitive plural to describe the relationship or association of 'crowns' specifically to 'oaks'.
Korony dębów w parku były pełne liści.
The crowns of the oaks in the park were full of leaves.
Here, 'dębów' serves as the genitive plural form to express what specifically can be cut down.