noun
leaving the capital; fleeing the capital
Often used in historical or literary contexts to describe someone, especially a noble or courtier, leaving the capital city (typically Kyoto) under unfavorable circumstances, such as defeat, disgrace, or exile.
平家の都落ちは、源平合戦の転機となった。
The Heike's flight from the capital marked a turning point in the Genpei War.
彼は
He lost the political struggle and was forced to flee the capital.