noun
killer; destroyer; annihilator
Used for someone or something that kills, destroys, or defeats decisively. Often appears in compounds like シリアルキラー (serial killer) or キラーコンテンツ (killer content).
彼はシリアルキラーとして知られている。
He is known as a serial killer.
この新製品は市場のキラーになるだろう。
This new product will be a market killer.
noun
seducer; tempter
Colloquial use for a person who is very attractive and seductive, often with a nuance of being dangerously charming. Can be used for both men and women.
彼女は男を惑わすキラーだ。
She is a seductress who leads men astray.