mondegreen

[ mon-di-green ]
/ ˈmɒn dɪˌgrin /

noun

a word or phrase resulting from a mishearing of another word or phrase, especially in a song or poem.
Compare eggcorn. See also malapropism.

Origin of mondegreen

1954; coined by Sylvia Wright, U.S. writer, from the line laid him on the green, interpreted as Lady Mondegreen, in a Scottish ballad

British Dictionary definitions for mondegreen

mondegreen
/ (ˈmɒndɪˌɡriːn) /

noun

a word or phrase that is misinterpreted as another word or phrase, usually with an amusing result

Word Origin for mondegreen

C20: from the Scottish ballad `The Bonny Earl of Murray', in which the line laid him on the green can be misheard as Lady Mondegreen