Hung up is a phrase that means being stuck or obsessed with something. There are different synonyms for this phrase that denote different meanings. For instance, the term fixated implies being overly focused on something to the point of obsession. Obsessed and preoccupied express the same idea of being caught up in something but with differing intensities. The phrase stuck or trapped indicates being unable to make a decision or move on from a particular situation. Phrases like held up or delayed denote a delay in getting something done or being unable to move forward due to an obstacle. In general, hung up can be interchangeably used with these terms to convey the same idea of being stuck or caught up in something.