This is the 1995th most frequent Polish word.
emeryturę
"Emeryturę" means "retirement pension."
The term 'emeryturę' is used here to refer to the act of retiring from work, expressed in the accusative case as the object of the verb 'przeszedł' (moved to).
Mój dziadek przeszedł na emeryturę w zeszłym roku.
My grandfather retired last year.
Here, 'emeryturę' denotes the concept of 'retirement' as a period in life, used in the accusative case as the goal of the preposition 'na' (for).
Marta oszczędza pieniądze na swoją przyszłą emeryturę.
Marta saves money for her future retirement.
In this example, 'emeryturze' is the locative case of 'emerytura', referring to the time period of being retired, following the preposition 'na' (on/about).