決けっ定てい打だ

noun

decisive blow; finishing move

General term for a decisive action that settles a contest, argument, or situation. Used in sports, combat, and figurative contexts.

• 彼かれの一ひと言ことが議ぎ論ろんの決けっ定てい打だとなった。

  His single remark became the decisive blow in the argument.

• ボクサーは最さい終しゅうラウンドで決けっ定てい打だを放はなった。

  The boxer landed the decisive blow in the final round.

noun

game-winning hit; clutch hit

Specifically in baseball, a hit that drives in the winning run or breaks a tie late in the game.

• 九きゅう回かい裏うら、彼かれのタイムリーが決けっ定てい打だとなりチームは勝しょう利りした。

  In the bottom of the ninth, his timely hit became the game-winner and the team won.