expression, godan verb (-ru)
surrender; capitulate; submit to an enemy
Literary or formal expression for surrendering to an opposing force, especially in military contexts. Often used figuratively for yielding in a debate or competition.
敵軍はついに軍門に下った。
The enemy army finally surrendered.
彼は議論に負けて軍門に下るしかなかった。
He lost the argument and had no choice but to concede.