This is the 13351st most frequent Polish word.
oszczędzają
"Save" or "are saving."
The word "oszczędzają" here means to save or economize, referring to reserving resources, specifically money.
Rodzice oszczędzają pieniądze na edukację dzieci.
Parents are saving money for their children's education.
In this sentence, "oszczędzają" means to conserve, applied to energy in a physical sense.
Sportowcy oszczędzają energię przed finałem.
Athletes save their energy before the final.
Here, "oszczędzają" also means to economize, this time specifically talking about water conservation.