make common cause with
US /meɪk ˌkɑː.mən ˈkɑːz wɪθ/
UK /meɪk ˌkɑː.mən ˈkɑːz wɪθ/

1.
联合起来, 与...结盟
to join with someone else in order to achieve a shared aim
:
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The two rival factions decided to make common cause with each other against the invading army.
两个敌对派系决定联合起来对抗入侵军队。
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Environmental groups often make common cause with local communities to protect natural habitats.
环保组织经常与当地社区联合起来保护自然栖息地。