Meaning

• To disallow; to proscribe.

  "Smoking in the restaurant is forbidden."

• (ditransitive) To deny, exclude from, or warn off, by express command.

• To oppose, hinder, or prevent, as if by an effectual command.

  "An impassable river forbids the approach of the army."

• To accurse; to blast.

• To defy; to challenge.

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