終わりが見えてきた色に関するIdiomシリーズ・・・
今回はgray（灰色）を含むものを掲載いたします。

生成AIを活用して英語で得た情報をもとに、私の方で一部日本語に変換・補足などをしています。また、自動生成された順ではなく、重要性・汎用性が高そうなものに絞っています。

1. Gray matter: 頭脳・知力
例: The professor’s lecture was a real test of our gray matter.

2. Gray-collar: 知的でありかつ肉体的労働の
例: Technical support is considered a gray-collar job because it requires manual and intellectual skills.

3. Gray power: 高齢者の（経済）力
例: The senior citizens’ association had significant gray power in local politics.

4. Gray hair: 白髪（はくはつ・しらが）
例: Despite his young age, John already has a few gray hairs.

5. Gray ghost: 知覚したり捕えたりするのが難しい存在
例: The legendary creature was known as the gray ghost due to its ability to vanish without a trace.

6. Gray outlook: 悲観的な見方
例: After losing his job, Mark had a gray outlook on life.

7. Gray zone/area: 違法すれすれの領域・法律が未整備の領域
例: The activities of some online streaming platforms fall into a gray zone of copyright infringement.

8. Gray market: 半合法的市場
例: Some collectors purchase rare coins from the gray market to expand their collections.

9. Gray marketeer: 不正流通業者 　cf. black marketeer（闇商人）
例: The police apprehended several gray marketeers selling counterfeit designer handbags.

10. Gray eminence: 黒幕・陰（かげ）の実力者
例: The CEO’s trusted advisor was a gray eminence in the company’s decision-making process.

文責：片野