胸むねに落おちる

expression, ichidan verb

to be convinced; to understand fully; to be satisfied

Describes a moment when something clicks emotionally or intellectually, often after initial doubt. Similar to 腑に落ちる but with a slightly more personal, heartfelt nuance.

See also: 腑に落ちる

• 彼かれの説せつ明めいを聞きいて、ようやく胸むねに落おちた。

  After hearing his explanation, I was finally convinced.