hoist the white flag

Verb

wave the white flag (third-person singular simple present waves the white flag, present participle waving the white flag, simple past and past participle waved the white flag)

1. To indicate to an opposing force that one is surrendering.
   • Then it was seen how perilous was the situation of the Boer snipers. . . . There was no escape for them save across the open. It says much for their courage that they took that perilous choice rather than wave the white flag, which would have ensured their safety.1900, Arthur Conan Doyle, chapter 30, in The Great Boer War

   Synonyms:

   capitulate

2. (figuratively) To yield, give up, or quit.
   • I started in with a fine left-hander on his right eye. Liverpool had been a fighter once, but dissipation and bad company had taken the nerve out of him. In ten minutes I had him lying on the sand waving the white flag.1911, O Henry, “The Day We Celebrate”, in Sixes and Sevens

   Synonyms:

   capitulate