山やまが当あたる

expression, godan verb (-ru)

guess turns out right; prediction hits the mark

Idiomatic expression used when a speculation, hunch, or forecast proves correct, often in contexts like exams, investigations, or business forecasts.

• 試し験けんに出でる問もん題だいを山やまが当あたって、いい点てんが取とれた。

  My guess about what would be on the exam turned out right, and I got a good score.

• 警けい察さつの読よみが山やまが当あたり、犯はん人にんはすぐに捕つかまった。

  The police's hunch hit the mark, and the culprit was caught quickly.