to top/cap/crown it all

to crown it all

An expression indicating the final item in a list of particularly positive or negative experiences or situations. What a bad day—I left my phone in the grocery store, my car broke down on the way home, and, to crown it all, my groceries broke through the bag as I was walking to the front door. They really threw me a wonderful party. Costumes, games, and, to crown it all, my favorite kind of pie.
See also: all, crown
Farlex Dictionary of Idioms.

to ˌtop/ˌcap/ˌcrown it ˈall

(spoken) used to introduce the final piece of information that is worse than the other bad things you have already mentioned: We went to a horrible restaurant. The food was awful, the music was far too loud, and to top it all, the waiter was rude to us.
See also: all, cap, crown, top
Farlex Partner Idioms Dictionary
See also:
  • if looks could kill
  • if looks could kill...
  • look daggers at, to
  • I'll get a rain check
  • I'll take a rain check
  • take a rain check
  • funeral