This is the 17563rd most frequent Polish word.
zdarzać
"Zdarzać" means "to happen" or "to occur."
The word "zdarzać" here is used reflexively ("zdarza mi się"), meaning "something happens to me". It indicates an event that occurs by coincidence or unintentionally.
Zdarza mi się zapominać o ważnych terminach.
I sometimes happen to forget important deadlines.
The word "zdarzać" is non-reflexive here, indicating an occurrence that ideally should not take place. It expresses undesirable events in this context.
Nie powinno się zdarzać, że spotkanie trwa dłużej niż godzinę.
It should not happen that the meeting lasts more than an hour.
In this case, "zdarzać" implies an event or incident that occurred, often with an unexpected or unplanned nature.