gloat over
Synonym discussion
Sense: phrasal verb/1
'Gloat over' is the most negatively charged of this group — it specifically implies taking pleasure in another person's failure or misfortune. 'Revel in' is broader: you can revel in success, attention, or good weather without any unkindness. 'Crow about' is informal and suggests loud, boastful talk rather than quiet satisfaction. 'Take delight in' is more formal and can be positive or negative depending on context. 'Boast about' focuses on pride in your own achievements, not necessarily at someone else's expense. For example, you might boast about a promotion (focus on you) but gloat over a colleague being passed over (focus on their loss).
Etymology
'Gloat' first appeared in English around the 1500s, possibly from a Scandinavian root meaning 'to stare or grin'. The sense of watching someone else's misfortune with satisfaction emerged later. The particle 'over' joined the verb by the 1800s to mark the target of the feeling.