success on the first try; hitting the target with one shot
A yojijukugo emphasizing achieving a goal or hitting a target in a single attempt. Often used figuratively for immediate success.
He passed the difficult exam on his first try.
一発必中を狙って、慎重に矢を放った。
Aiming to hit the target with one shot, he carefully released the arrow.
A yojijukugo composed of 一発 (one shot) and 必中 (certain hit). The exact historical origin is uncertain, but it follows a common four-character idiom pattern emphasizing decisive success.