What does Lady Macbeth imply in her speech, "The raven himself is horse......"?

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lmillerm eNotes educator| Certified Educator

Ravens were considered to be birds of bad omens. Lady Macbeth, after reading her husband's letter, knows that it is up to her to find a way to help her husband become king. She calls to the spirits to take away her guilt and allow her to go through with the murderous acts.