1. To disallow; to proscribe.
    Smoking in the restaurant is forbidden.
  2. To deny, exclude from, or warn off, by express command.
  3. To oppose, hinder, or prevent, as if by an effectual command.
    An impassable river forbids the approach of the army.
  4. To accurse; to blast.
  5. To defy; to challenge.

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