forbid

verb5

1. •
   to order by a rule or a law that something must not be done

   • Smoking in the restaurant is forbidden.
2. •
   To deny, exclude from, or warn off, by express command.

   • Have I not forbid her my house? — 1597
3. •
   To oppose, hinder, or prevent, as if by an effectual command.

   • An impassable river forbids the approach of the army.
4. •
   (no longer used) To accurse; to blast.

   • He shall live a man forbid. — 1606
5. •
   (no longer used) To defy; to challenge.

   • What part of "no" do you forbid to understand?