eggcorn

The story

Suggested by British-American linguist Geoffrey K. Pullum following a discussion on the Language Log website on September 23, 2003, by American linguist Mark Liberman, about a woman who had long believed the word acorn to be egg corn.

First known use, by meaning

• from 2003 A word or phrase that sounds like and is mistakenly used in a seemingly logical or plausible way for another word or phrase either on its own or as part of a set expression