Brewer's: Other Day

(The). The day before yesterday. The Old English other was used for second, as in Latin, unus, alter, tertius; or proximus alter, tertius. Starting from to-day, and going backwards, yesterday was the proximus ab illo; the day before yesterday was the altera ab illo, or the other day, and the day preceding that was tertius ab illo, or three days ago. Used to express “a short time ago.”

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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