"Hung down" is a descriptive term often used to refer to anything that droops or hangs in a downward direction. However, there are various synonyms that can be used to describe this action. Some of the most common synonyms for "hung down" include "dangle", "hang loosely", "sag", "droop", "hang down", "swing", and "flap". All of these words convey a sense of something being suspended or not fully supported, and can be used to describe anything from a person's arms to a piece of clothing or decoration. It's always important to choose the right synonym that can accurately convey the intended meaning.