tachiyoru
1.

To approach or come close to a certain place or object, often stopping to observe or interact with it briefly.

2.

To visit a location or person casually while en route to a primary destination, typically as a side trip or quick stop.

3.

To take refuge or rely on someone or something for support when in need, indicating closeness or dependence.

Example:

昨日彼がぶらっと立ち寄った。