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Большой англо-русский словарь (с транскрипциями)
[ðeə] сокр.; разг. = they are
разг. сокр. от they are
they're сокр. разг. = they are
they're сокр. разг. = they are
Merriam-Webster's Collegiate® Dictionary, 11th Edition
Date: circa 1595 they are