What is Musn't?
1.
"Must Not"
Abbreviation often confused with the correct term: "Mustn't"
Confusion arises because of the pronounciation and feeling the "t" should be left out.
Colin musn't have been taught English in primary school.
OR
Nelson musn't lock himself outside of his house.
See 
Random Words:
1. 
A disease commonly occuring in people of the female gender, when they go on large shopping sprees, and buy beautiful new shoes. This dis..