首しゅ魁かい

noun

ringleader; mastermind; leader of a plot

Refers to the person who instigates or leads a conspiracy, rebellion, or criminal scheme. Often used in historical or dramatic contexts.

• 事じ件けんの首しゅ魁かいはまだ捕つかまっていない。

  The ringleader of the incident has not been caught yet.

• 彼かれはクーデターの首しゅ魁かいとして知しられている。

  He is known as the mastermind of the coup.

noun

forerunner; pioneer

A less common, somewhat literary use for someone who leads the way in a field or movement. Often replaced by 先駆者 or パイオニア in modern speech.

• 彼かれは近きん代だい医い学がくの首しゅ魁かいと称しょうされることもある。

  He is sometimes called a pioneer of modern medicine.