Folk etymology or reanalysis – sometimes called pseudo-etymology, popular etymology, or analogical reformation – is a change in a word or phrase resulting from the replacement of an unfamiliar form by a more familiar one. The form or the meaning of an archaic, foreign, or otherwise unfamiliar word is reanalyzed as resembling more familiar words or morphemes. Rebracketing is a form of folk etymology in which a word is broken down or "bracketed" into a new set of supposed elements. Back-formation, creating a new word by removing or changing parts of an existing word, is often based on folk etymology.