This is the 14317th most frequent Polish word.
przechodzień
"Przechodzień" means "passer-by" in English.
The word 'przechodzień' is used here to refer to an individual who is walking by on the street without a specific focus other than moving about.
Przechodzień na ulicy zapytał mnie o drogę.
A passerby on the street asked me for directions.
In this sentence, 'przechodniów' (plural of 'przechodzień') denotes the people passing by who took action by helping in an emergency.
Po wypadku wielu przechodniów udzielało pierwszej pomocy.
After the accident, many passersby were providing first aid.
Here, 'przechodnia' (in a grammatical case of 'przechodzień') describes someone passing by who was drawn to observe an event or scene deliberately.