Doctors are "hanging crepe" when they prepare the family of a patient for the patient's death. That doesn't always mean the patient, is doomed, however.
"'Hanging the crepe' is an old phrase, referring to the no-fail ploy of foretelling a bad outcome to patient, family and friends," neurologist Joseph Friedman wrote. "If the prediction comes true, the doctor was prescient, and if not true, a savior."
The saying comes from the practice of hanging black crepe fabric over a door to signify a family is in mourning.