malapropism
Pronunciation: \ˈma-lə-ˌprä-ˌpi-zəm\
Function: noun
Etymology:
Mrs. Malaprop, character noted for her misuse of words in R. B. Sheridan's comedy The Rivals (1775)
Date: 1849
1: the usually unintentionally humorous misuse or distortion of a word or phrase; especially : the use of a word sounding somewhat like the one intended but ludicrously wrong in the context
2: malaprop
— mal·a·prop·ist \-ˌprä-pist\ noun

from Ben Lim