旗はた振ふり役やく

noun

initiator; instigator; leader; flagman

Refers to a person who takes the lead in starting or organizing something, often in a group or movement. Can also mean a literal flagman, but the figurative sense is more common.

• 彼かれはプロジェクトの旗はた振ふり役やくとして、チームをまとめた。

  He brought the team together as the initiator of the project.