The difference between Ereyesterday and Yestreen
When used as nouns, ereyesterday means the day before yesterday, whereas yestreen means the night before.
Ereyesterday is also adverb with the meaning: on the day before yesterday.
check bellow for the other definitions of Ereyesterday and Yestreen
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Ereyesterday as an adverb (obsolete):
On the day before yesterday.
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Ereyesterday as a noun (obsolete):
The day before yesterday.
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Yestreen as a noun (chiefly, archaic, poetic, or, Scottish):
The night before.