To top off

to complete by putting on, or finishing, the top or uppermost part of; as, to top off a stack of hay; hence, to complete; to finish; to adorn.
to completely fill (an almost full tank) by adding more of the liquid it already contains.

See also: Top, Top

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
Everybody yelled at him and laughed at him and sassed him, and he sassed back, and said he'd attend to them and lay them out in their regular turns, but he couldn't wait now because he'd come to town to kill old Colonel Sherburn, and his motto was, "Meat first, and spoon vittles to top off on."
Five more towers are already in the lineup for completion in 2019-Novotel Suites Manila at Acqua Private Residences in Mandaluyong; the 35-story Peza-accredited and LEED pre-certified office building Century Diamond Tower, a joint-venture project of CPG with Mitsubishi Corp.; and the luxurious office-residential tower Century Spire with amenities interior designed by Armani Casa and architecture by Dabiel Libeskind is scheduled to top off In April 2019.
Damosa Land Vice President Cary Lagdameo shovels cement to top off the construction of Seawind's Tower 4.
So if a customer asks Thurman to top off the tank - adding more gas after the pump automatically clicks off - he'll do it.
Companies generally contract with local suppliers to top off the tanks as needed, he adds, but most units have at least 48 hours of runtime in the event of an emergency.
As a final safety note, when you're using the AS-3166 antenna element to top off your mast, make sure you use safety tip caps.
"We hope to get high-caliber students, so we have different options to top off on the funding," he says.
And to top off the fun, there's a product toss that lasts for an hour.
The wonderful chapter on desserts offers Cream Puffs with Ice Cream and Chocolate Sauce along with other savory dishes to top off any meal.
The researchers calculated the consequence of filling that surface with just enough fluid to top off all the small divots without causing them to overflow.
To top off that sweet bread, wrap it in colored cellophane paper and tie it with fancy ribbons.