antigram
adj. An anagram in which the new word or phrase is the opposite of the original.
Etymology
Examples
1997
The converse of the aptagram is the antigram. In antigrams, a word or phrase gets rejuggled into another word or phrase that bears a meaning opposite to that of the base. Thus, astronomers/moon starers is an aptagram while astonomers/no more stars is an antigram.
—Richard Lederer, “Looking at language; Check out this ever-changing parade of antigrams,” The Patriot-Ledger, April 12, 1997
1997
Closely associated with anagrams which "reflect" the original meaning are antigrams that "deflect" the original sense. Here are five examples of this contradictory genre.
—Howard Richler, “Anagrams are rare jewels in word treasury,” The Gazette (Montreal, Quebec), March 08, 1997
1991 (earliest)
Antigrams are anagrams that mean the opposite of the original word or phrase when the letters are rearranged. For example: violence — nice, love; evangelist — evil's agent; funeral — real fun.
—Marty Smith, “What's in a name,” The Advertiser, July 08, 1991
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