shadow

He works in the shadow of his famous brother.

意味（1）

Unofficial, informal, unauthorized, but acting as though it were.

The human resources department has a shadow information technology group without headquarters knowledge.

意味（2）

Having power or influence, but not widely known or recognized.

The director has been giving shadow leadership to the other group's project to ensure its success.

意味（3）

(politics) Acting in a leadership role before being formally recognized.

意味（4）

(Australia, politics) Part of, or related to, the opposition in government.