exult at

exult at (something)

To feel great happiness due to someone or something in particular. I doubt you could say anything to upset them right now—they're still exulting at their engagement.
See also: exult
Farlex Dictionary of Idioms.

exult at something

 and exult over something
to rejoice because of something; to rejoice about something. We exulted at the end of the hostilities. The citizens exulted over the downfall of the dictator.
See also: exult
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • exult
  • exult at (something)
  • exult in
  • exult in (something)
  • exult over (something)
  • feel a glow of happiness
  • satisfaction
  • God's in his heaven; all's right with the world
  • money can't buy happiness
  • breathe a sigh of relief