fly the flag

Meaning

1. fly / show / wave the flag

   to show your support for your country, an organization or an idea to encourage or persuade others to do the same

In the movies · 1

• They're angry when we fly the Confederate flag at ball games.The Best of Enemies2019

From the same entry

• keep the flag flying
• like waving a red flag in front of a bull
• flag down
• flag up