Eggcorn
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An eggcorn is the alteration of a word or phrase through the mishearing or reinterpretation of one or more of its elements, creating a new phrase that is plausible when used in the same context.
Cafe chalkboard advertising a "pre fixed" menu, an eggcorn of the French prix fixe (fixed price)
Folk etymology
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Folk etymology is a change in a word or phrase resulting from the replacement of an unfamiliar form by a more familiar one through popular usage. The form or the meaning of an archaic, foreign, or oth
Eggcorn
…Eggcorns are similar to but distinct from several other linguistic expressions: Where a folk etymology is a change in the form of a word caused by widespread misunderstanding of the word's etymology, an eggcorn may be limited to one person rather than…
An example of folk etymology is the dialectal English word sparrowgrass for asparagus.