/ Dictionary / Index T top-off: Meaning and Definition of Find definitions for: top-off Pronunciation: (top'ôf", -of"), [key] — n. Australian Slang. a person who informs on another, often as if by accident or as a joke. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: top-off (Thesaurus) topo- top-of-the-line Related Content Daily Word Quiz: wizened Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language