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Related to eggcorn: mondegreen
A series of words that result from the misunderstanding of a word or phrase as some other word or phrase having a plausible explanation, as free reign for free rein, or to the manor born for to the manner born (from William Shakespeare's Hamlet).
a malapropism or misspelling arising from similarity between the sound of the misspelled or misused word and the correct one in the accent of the person making the mistake
[C21: based on the mishearing of acorn as eggcorn, which was considered to be apposite]