Mondegreen
A mondegreen is a word or phrase produced by mishearing part of a song lyric or spoken passage as a different but plausible expression.
The distress signal "Mayday" comes from the French "M'aidez" (help me). In 1921, radio officer Frederick Mockford at London's Croydon Airport proposed it for aviation communication with Paris, as both English and French speakers could understand it.
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