cap it (all) off

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cap it (all) off

To finish or complete an experience or situation in an especially positive or negative way. Our date was fantastic! We went for dinner, saw a great film, and then we capped it off with some salsa dancing! What a bad day: I left my phone in the grocery store, my car broke down on the way home, and, to cap it all off, my groceries broke through the bag as I was walking to the front door.
See also: cap, off