This is the 1519th most frequent Turkish word.
geçerken
"While passing" or "as passing by."
Here, 'geçerken' means 'while passing by', explaining an action concurrent to another event.
Yolda yürürken kitapçıdan geçerken içeri girdim.
While walking on the road, I entered the bookstore as I passed by.
In this sentence, 'geçerken' indicates an action (passing through) happening while observing or experiencing something else (hearing birds).
Sabahları parktan geçerken kuşların sesini duyuyorum.
In the mornings, I hear the sound of birds as I pass through the park.
Here, 'geçerken' is used to denote an incidental observation during the act of passing by a specific location.