Backronym (noun)
bak-ron-im
An existing word turned into an acronym by creating an apt phrase whose initial letters match the word, as to help remember it or offer a theory of its origin.
First recorded in 1980–85 and formed from the word back “toward the rear” and (ac)ronym, “a word formed from the initial letters or groups of letters of words in a set phrase and pronounced as a separate word.”
Example sentences
“Some people believe the word news stands for “notable events, weather, and sports,” but that’s not accurate; it’s a backronym.”