The difference between Ereyesterday and Yesternight
When used as nouns, ereyesterday means the day before yesterday, whereas yesternight means a preceding night.
When used as adverbs, ereyesterday means on the day before yesterday, whereas yesternight means last night.
check bellow for the other definitions of Ereyesterday and Yesternight
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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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Yesternight as an adverb (archaic):
Last night.
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Yesternight as a noun (archaic):
A preceding night.