knockoutpunch
nounUK /ˈnɒkaʊt pʌntʃ/
US /ˈnɑːkaʊt pʌntʃ/
A very strong punch that makes someone fall down.
The boxer won the match with a powerful knockoutpunch.
OTHER MEANINGS
2. A hit that ends a fight immediately.
His knockoutpunch ended the fight in the first round.
3. A surprising and powerful action or remark.
Her speech was a knockoutpunch to the critics.
4. In games, a move that defeats an opponent at once.
He used a knockoutpunch to win the video game battle.