His final rebuttal was the perfect kill-shot that silenced the opponent.

kill-shot 是由 kill（杀死）和 shot（射击）组成的复合名词。kill 表示"致命"，shot 表示"射击、一击"。 kill-shot 字面意思是"致命一击"，引申为"决定性的反驳或攻击"，指能够彻底击败对手的言论或行动。