godan verb (-ru), intransitive verb
slam into; crash into; run into
Emphatic physical collision. Often implies a forceful, sudden impact against a surface or object.
車がガードレールにぶち当たった。
The car slammed into the guardrail.
ボールが窓ガラスにぶち当たって割れた。
The ball crashed into the window and broke it.
godan verb (-ru), intransitive verb
face (difficulties); confront (trouble)
Metaphorical use: to run up against a difficult situation or problem head-on. Often used with words like 困難, 壁, 現実.
彼は大きな困難にぶち当たった。
He faced a major difficulty.
現実にぶち当たって初めて自分の甘さに気づいた。
Only when I confronted reality did I realize my naivety.