not, don't

毋 depicts a woman with large breasts. A mother stores milk in her breasts to feed her child, and breasts are a distinctive feature of a mother. Therefore, 毋 was used to represent this, but the meaning was later taken over by the character 母. In order to protect her children, a mother will prevent them from coming into contact with anything dangerous. From this, 毋 acquired a negative sense and means “do not” or “not have.”