Where does theirn come from?

It is traced to Middle English.

theirn

Word Rarity Very rare

Frequency: Zipf frequency 0.00 in modern English

Scrabble Score

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pron

British usage; American usage

"I do believe he cared just as much for his people as white folks does for their’n"
"“Nothin,” Dilsey said. “You tend to yo business en let de whitefolks tend to deir'n.”"

From Middle English theiren, compare hern. Displaced in standard speech by the -s form, theirs, which see for more.

their'n (alternative)

How to pronounce theirn

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