Make common cause

verb

Definitions

Verb
  1. 1
    To cooperate, to enter into an alliance for a shared goal.

    "[…] in a great community, the reformer has the voice and approbation of a majority to encourage him. In a very narrow circle he will have no part of the society, in which he lives, to support him against the rest. They will all make common cause against him, and sooner or later overcome his resolution, or break his heart."

Etymology

Possibly a calque of French faire cause commune, first attested in the same period (1787).

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