A four-character idiom meaning bitter enemies or rivals forced to share the same situation (literally 'Wu and Yue in the same boat'); strange bedfellows.
プロジェクトでは意見が対立しているチームが呉越同舟で協力しなければならない。
In the project, teams with opposing views must cooperate as strange bedfellows.
呉越同舟の状況だが、まずは当面の目標を達成しよう。
Although they are like enemies in the same boat, let's first achieve the immediate goal.