過剰修正

Also known as hypercorrectism, hypercorrectness, overcorrection

In sociolinguistics, hypercorrection is the nonstandard use of language that results from the overapplication of a perceived rule of language-usage prescription. A speaker or writer who produces a hypercorrection generally believes through a misunderstanding of such rules that the form or phrase they use is more "correct", standard, or otherwise preferable, often combined with a desire to appear formal or educated.