呉越同舟 (ごえつどうしゅう): bitter enemies in the same boat; rivals finding themselves together by chance; strange bedfellows

bitter enemies in the same boat; rivals finding themselves together by chance; strange bedfellows

Two warring states put in one boat by a storm, rowing together because the alternative is drowning. For rivals forced into cooperation by circumstance rather than goodwill.

The same saying in Chinese: 吴越同舟