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Difference between Have a falling out and Have a fallout

have a falling outhave an argument or disagreement, especially one that leads to strained relations:

  • He was asked whether he and Dave had had a falling out, and he totally dodged the question.

have a fallout—(of an event or situation) have lasting negative consequences:

  • The controversy has had a fallout in parliament with very little business being conducted over the past few days.