run hot and cold

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run hot and cold

  1. (idiomatic) To alternate between two opposite extremes, such as enthusiasm and disinterest or success and failure.
    Henrietta's feelings for Delbert run hot and cold--one minute she's hopelessly in love with him, and the next she can't stand the sight of him.
    The business runs hot and cold; some months our firm doesn't earn enough to cover expenses and other months, we net 400% profits.