godan verb (-ru), intransitive verb
bump into; collide with; crash into
Physical collision with an object or surface; often used with 壁, 車, 人, etc.
車がガードレールに突き当たった。
The car crashed into the guardrail.
暗くて壁に突き
It was dark and I bumped into the wall.
godan verb (-ru), intransitive verb
come to the end of; reach the end of
Used for reaching the physical end of a street, corridor, or path; often with 道, 廊下, 行き止まり.
この道をまっすぐ行くと、突き当たったところに郵便局があります。
If you go straight down this road, you'll find a post office at the end.
godan verb (-ru), intransitive verb
run into (difficulties); face (a problem); hit a wall
Metaphorical use for encountering an obstacle, difficulty, or deadlock; common with 問題, 困難, 壁.
新しいプロジェクトは資金不足で壁に突き当たった。
The new project hit a wall due to lack of funds.
研究を進めるうちに、いくつかの問題に突き当たった。
As we proceeded with the research, we ran into several problems.