Misspelling of 'their', the possessive form of they, indicating ownership by multiple people.
Incorrect spelling of 'their' from Old Norse 'þeirra'. This common misspelling likely occurs due to the 'i before e except after c' rule, though 'their' is an exception.
This misspelling is so common that spell-checkers specifically watch for it. Interestingly, English possessive pronouns like 'their' don't follow the usual apostrophe rules, which adds to the confusion for many writers.
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