WordReference Random House Unabridged Dictionary of American English © 2020
magic bullet, 
  • something that cures or remedies without causing harmful side effects:So far there is no magic bullet for economic woes.
    • 1965–70

    Collins Concise English Dictionary © HarperCollins Publishers::
    magic bullet n
    1. informal any therapeutic agent, esp one in the early stages of development, reputed to be very effective in treating a condition, such as a malignant tumour, by specifically targeting the diseased tissue

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