1To happen to pass by a place — to come across a spot by chance while going somewhere.
たまたま通りかかった公園で、久しぶりに友達に会った。
I happened to pass by a park and ran into a friend I hadn't seen in a while.
通りかかった店から良い匂いがしたので、思わず入ってしまった。
A shop I happened to pass by smelled so good that I couldn't help going in.
通りかかった人が倒れている男性を助けてくれた。
A passerby who happened to be going by helped a man who had collapsed.
工事現場の前を通りかかったら、道が封鎖されていた。
When I happened to pass by the construction site, the road was blocked off.