Wiktionary
vb. (context idiomatic English) To emphasize or underscore; to make something even better or worse.
Usage examples of "top it off".
He was looking forward to coaxing her into a pair of well-worn jeans, maybe with one of his old flannel shirts to top it off.
This bin was nearly full, and the crews would top it off in the morning with a final load before launching the cargo hauler.
And to top it off, the catch question, whether Rhodan knew about this meeting.
And to top it off, Collor was facing impeachment after exposure of a corruption scandal that also set new records.
And then, to top it off, Violet invited him to a formal dance given by the pledges of her sorority.
And, to top it off, her steadholdership gave her precedence over every one of the nobles who'd voted to boot her out.
And, to top it off, her steadholdership gave her precedence over every one of the nobles who’.
Caesare Aldanto was urbane and sophisticated and, to top it off, tall, golden-haired.
One or more meetings every evening, breakfast clubs on Saturdays and Sundays, a Kiwanis, Rotary, or Lions, or Chamber of Commerce lunch to hit at noon, an occasional appearance in court, endless correspondence, phone calls, conferences, and, to top it off, as many hours of doorbell pushing as I could force into each day.