Responsibility shared by two or more parties; joint or collective responsibility (often used legally or morally).
プロジェクトの失敗はチーム全員の共同責任だ。
The project's failure is the joint responsibility of the entire team.
親は子どもの教育に対して共同責任を持っている。
Parents share responsibility for their children's education.
取引上のトラブルは会社と担当者の共同責任になることがある。
In business disputes, the company and the person in charge may share joint responsibility.