expression, godan verb (-ru)
wave a flag
Literal action of waving a flag, often for signaling or cheering.
応援団が旗を振って選手を励ました。
The cheering squad waved flags to encourage the players.
expression, godan verb (-ru)
show the way; lead
Figurative use: to take the lead or guide others, like a flag-bearer showing the path.
彼は新しいビジネスモデルで業界に旗を振った。
He showed the way in the industry with a new business model.