expression
in a quarrel, both parties are to blame
A traditional saying meaning that when a fight or dispute occurs, both sides share responsibility and should be punished or reconciled equally. Often used as a principle in conflict resolution.
子供の喧嘩は喧嘩両成敗で、どちらも叱られた。
The children's fight was settled with both sides being scolded, as in a quarrel both are to blame.
喧
Following the principle that both parties are at fault in a fight, they ended up apologizing to each other.