killinga. Literally, that kills; having power to kill; fatal; in a colloquial sense, conquering; captivating; irresistible.()Those eyes are made so killing. (Pope.)Nothing could be more killingly spoken. (Milton.)n.1. The act or process of causing a living organism to die.()2. An unusually large gain in a financial or business transaction or enterprise; as, she made a killing trading cattle futures.()