One of the mysteries of the English language finally explained.
The day of a move to a new location, especially to a new residence; (US) the day on which leases normally expire in a particular city or region (in New York, May 1), frequently associated with household removals.
Mid 19th century; earliest use found in Workingmen's Advocate (New York). From moving + day.
moving day/ˈmuːvɪŋ ˌdeɪ/
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