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.

• 地ち域いきの清せい掃そう活かつ動どうで旗はた振ふり役やくを買かって出でた。

  I volunteered to be the organizer for the local cleanup activity.