Definitions for malapropismˈmæl ə prɒpˌɪz əm
Random House Webster's College Dictionary
mal•a•prop•ismˈmæl ə prɒpˌɪz əm(n.)
a confused use of words in which an appropriate word is replaced by one with similar sound but ludicrously inappropriate meaning.
an instance of this, as in “Lead the way and we'll precede.”
Origin of malapropism:
1840–50; after Mrs. Malaprop, a character in Sheridan's The Rivals (1775)
the unintentional misuse of a word by confusion with one that sounds similar
The blundering use of an absurdly inappropriate word or expression in place of a similar sounding one.
An instance of this; malaprop.
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. Mrs. Malaprop is perhaps the best-known example of a familiar comedic character archetype who unintentionally substitutes inappropriate but like-sounding words that take on a ludicrous meaning when used incorrectly.
a grotesque misuse of a word; a word so used