We found 4 dictionaries that define the word the day before yesterday:

General (4 matching dictionaries)

1. the day before yesterday: Merriam-Webster
2. the day before yesterday: Cambridge Advanced Learner's Dictionary

▸ Words similar to the day before yesterday ▸ Usage examples for the day before yesterday ▸ Idioms related to the day before yesterday ▸ Wikipedia articles (New!) ▸ Words that often appear near the day before yesterday ▸ Rhymes of the day before yesterday ▸ Invented words related to the day before yesterday