[V] ~ (about / at / over sth) to show that you are happy about your own success or sb else's failure, in an unpleasant way:
She was still gloating over her rival's disappointment. * Having lost a large percentage of the vote, they were in no position to gloat. * I hope you haven't just come here to gloat.
gloating adjective:
a gloating look / remark
