1. To form curds so that it no longer flows smoothly; to cause to form such curds. (usually said of milk)
    Too much lemon will curdle the milk in your tea.
  2. To clot or coagulate; to cause to congeal, such as through cold. (metaphorically of blood)
  3. To cause a liquid to spoil and form clumps so that it no longer flows smoothly

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