a word or phrase resulting from a mishearing of another word or phrase, especially in a song or poem.
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British Dictionary definitions for mondegreen
a word or phrase that is misinterpreted as another word or phrase, usually with an amusing result
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012