The phrase "make common cause" means to unite or work together towards a common goal. There are several synonyms for this phrase that can be used interchangeably. Some of these include: collaborate, cooperate, join forces, work in tandem, pool resources, align interests, team up, come together, march in step, and work towards a common aim. Each of these phrases conveys the idea of partnerships, shared goals, and teamwork. Whether in business, politics, or social movements, making common cause is a powerful way to achieve lasting change by leveraging the strength of collective action and collaboration.