make common cause with
US /meɪk ˌkɑː.mən ˈkɑːz wɪθ/
UK /meɪk ˌkɑː.mən ˈkɑːz wɪθ/
1.
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.
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Environmental groups often make common cause with local communities to protect natural habitats.