(grammar) incorrect because of a mistakenidea of standardusageThe often exaggerated addition of /h/ before words like "out" in written Cockney is a hypercorrect affectation.
(transitive) To change (a word or phrase) to an incorrect form in the mistaken belief that it is standard usage.
2007, October 28, William Safire, And Now This, I use reduplicate to mean redouble, though both words should mean quadruple, but English is funny that way, so hold off on the hypercorrecting gotcha!