In the context of plain language, what does 'must not' signify?

In the context of plain language, the phrase 'must not' signifies a prohibition. This term is utilized to indicate something that is strictly not allowed or is forbidden, clearly communicating to the reader that an action or behavior should not take place. It removes ambiguity and ensures that the reader understands that there are serious consequences or negative implications if the action is taken.

In plain language, using 'must not' helps to create a clear and direct guideline that establishes firm boundaries. It contrasts with terms such as 'recommendation,' 'obligation,' or 'suggestion,' which imply varying degrees of flexibility and choice rather than an outright prohibition. The use of 'must not' ensures that the intended message is understood firmly and without room for misinterpretation, which is a critical aspect of effective communication, particularly in instructional or regulatory contexts.