[ oh-ver-mawr-oh, ‐mor-oh ]
/ ˌoʊ vərˈmɔr oʊ, ‐ˈmɒr oʊ /
the day after tomorrow: I’ve heard that tomorrow and overmorrow may bring exceptionally high waves.
on the day after tomorrow: If we leave overmorrow, we should not miss a day of the festival.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019