dance on (someone's) grave

Translations
танцевать на (чьей-то) могиле
He was so disliked that many people were ready to dance on his grave.
Он был настолько непопулярен, что многие были готовы танцевать на его могиле.
Definitions
To celebrate or express joy over someone's misfortune or death, often in a way that is considered disrespectful or vindictive.