To ‘cap off’ or ‘cap something off’ is a common idiomatic expression with several different usages. Examples are to cap it all off and capped off. This idiom is unusual in that the tense can be changed.

Meaning of ‘To Cap Something Off’
To cap something off means to end it in a particularly good or bad way.
Examples Of Use
“We had a great dinner and capped off the evening with a few drinks at Bernie’s Bar.”
“I got laid off work, lost my wallet, and to cap it all off, my wife left me.”
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