This is the 700th most frequent Polish word.
kosztów
"Kosztów" means "of costs" in English.
In this sentence, "kosztów" is a noun in the genitive plural form, referring to the financial expenses associated with the project.
Nie przewidzieliśmy wszystkich kosztów tego projektu.
We did not anticipate all the costs of this project.
Here, "kosztów" again serves as a genitive plural noun, indicating financial expenditures needed for a business expansion.
Rozwinięcie firmy wymaga pokrycia dużych kosztów.
Expanding the company requires covering significant costs.
"Kosztów" in this instance is part of a phrase signifying the avoidance of further expenses. The genitive case demonstrates the relation of possession or association.