noun
Refers to a piece of information that reveals important plot details, or to a device on a vehicle that reduces lift. Context determines the meaning.
映画のスポイラーを聞いてしまって、がっかりした。
I heard a spoiler for the movie and was disappointed.
あの車のリアスポイラーはかっこいいね。
That car's rear spoiler looks cool, doesn't it?