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.