godan verb (-ru), intransitive verb
come across; run into; hit upon
Describes encountering something unexpectedly while moving forward, or reaching an impasse. Often used for physical obstacles, dead ends, or chance discoveries.
山道を歩いていると、小さな滝に行き当たった。
While walking along the mountain path, I came across a small waterfall.
交渉は難航し、ついに行き当たってしまった。
The negotiations hit a snag and finally reached a deadlock.