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third person, singular reflexive of they
(reflexive, sometimes proscribed) The reflexive form of they, the third-person singular personal pronoun. The single person previously mentioned, as the object of a verb or following a preposition (also used for emphasis). quotations examples
[…] they woulden't [sic] always be trying to make Themself Look Diffarunt [sic] from what nature made Them.
1899 December 6, “Paw Baldness”, in Shiner Gazette
THE author who masqueraded as Helen Demidenko yesterday urged the hoaxer who deceived the respected right-wing journal Quadrant to unmask themself.
2009 January 8, Samantha Maiden, “Hoaxer, out yourself: 'Demidenko'”, in The Australian
... somedays there will be an odd number of quadders and so somebody might have to sit by themself in the back.
2013 January 8, John Stoltenberg, Gonerz
(nonstandard, sometimes proscribed) Synonym of themselves (the third-person plural). quotations
[…] and the same is here thought of al men to be so vailable and sufficient, as can be required, accept and take the said commission and dispensation so thankfully, and themself so satisfied with the same, that they repute and think themself not only singularly obstringed and bound to the Popes […]
1822, John Strype, Ecclesiastical Memorials, Relating Chiefly to Religion, page 119