red rag to a bull

Noun

Something that will enrage another particular person.

Japanese Meaning

特定の人物を激怒させる要因となるもの。 / ある特定の相手に対し、怒りや感情の爆発を引き起こす刺激物や行動。

Bringing up his ex at the meeting was a red rag to a bull, and he lost his temper immediately.

会議で彼の元カノの話を持ち出すのは彼を激怒させるもので、彼はすぐにかっとなった。

Sense（1）

Something that will enrage another particular person.

Simply mentioning the word "nationalism" to him is like a red rag to a bull.

red rags to a bull

（ plural ）