This is the 1755th most frequent Polish word.
ustalił
"Ustalił" means "he/it established" or "he/it determined."
In this sentence, "ustalił" is used to mean "established" or "set" in the context of arranging a date or schedule.
Andrzej ustalił termin spotkania z klientem.
Andrzej established the meeting date with the client.
Here, "ustalił" means "determined" or "ascertained" in the context of investigating and finding information.
Detektyw ustalił miejsce pobytu podejrzanego.
The detective determined the suspect's whereabouts.
In this context, "ustalił" is used to mean "determined" or "finalized," referring to setting guidelines or rules.