Origin of malapropism
Word Origin for malapropism
1826, from Mrs. Malaprop, character in Sheridan's play "The Rivals" (1775), noted for her ridiculous misuse of large words (e.g. "contagious countries" for "contiguous countries"), her name coined from malapropos.
A humorous confusion of words that sound vaguely similar, as in “We have just ended our physical year” instead of “We have just ended our fiscal year.”