noun, noun or participle which takes 'suru'
dramatic reversal with one blow; turning the tables in one move
Idiomatic expression originally from baseball (a game-winning home run), now used broadly for any situation where a single decisive action completely reverses a disadvantageous situation.
彼のホームランで一発逆転した。
They turned the game around with his home run.
新製品のヒットで会社は一発
The company is aiming for a dramatic turnaround with the hit new product.