malapropism

Origin

From the name of Mrs. Malaprop, a character in the play The Rivals (1775) by Richard Brinsley Sheridan + -ism. As dramatic characters in English comic plays of this time often had allusive names, it is likely that Sheridan fashioned the name from malapropos (“inappropriate; inappropriately”), from French mal à propos. Mrs. Malaprop is a classic example of a familiar comedic character archetype who unintentionally substitutes inappropriate but like-sounding words that take on a ludicrous meaning when used incorrectly.