/ ˈtɒpˌɔf, -ˌɒf /PHONETIC RESPELLING
a person who informs on another, often as if by accident or as a joke.
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Origin of top-off
First recorded in 194045; noun use of verb phrase top off to inform [on someone]
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
How to use top-off in a sentence
There is a particular focus in the magazine on attacking the United States, which al Qaeda calls a top target.
In the meantime, Epstein has tried to use his charitable projects to float him back to the top.
Although the blood-spattered offices will be off-limits, staff have vowed to continue producing the magazine.
A passing off-duty school safety officer named Fred Lucas said that he had been told the man was a drug dealer.
If so, he has his silence -- on top of poor judgment -- to blame.
He came to the top of the stairs with a lamp in his hand, and wanted to know what the rumpus was about.
The offspring of the ungodly shall not bring forth many branches, and make a noise as unclean roots upon the top of a rock.
A far-off volley rumbled over the plain, and a few birds stirred uneasily among the trees.
The jagged top and spurs of San Jacinto Mountain shone like the turrets and posterns of a citadel built of rubies.
The way was under a double row of tall trees, which met at the top and formed a green arch over our heads.
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British Dictionary definitions for top-off
[tr, adverb] to finish or complete, esp with some decisive actionhe topped off the affair by committing suicide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Other Idioms and Phrases with top-off
Fill a container, especially when it is almost full to begin with. For example, I don't need much gas; just top off the tank, please. [First half of 1900s]
Finish, especially in a spectacular way, as in They topped off their trip with a visit to the White House. [First half of 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.