19/09/21 17:41:15.73 ZA+tYA0Z0.net
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they
—used to refer to a single person whose gender identity is nonbinary (see NONBINARY sense c)
Websterにはつい最近載ったが
この単数の不確かな性別のtheyはOxordじゃずいぶん前に取り上げられている。
ODE
[singular]used to refer to a person of unspecified sex
OALD
used instead of he or she to refer to a person whose sex is not mentioned or
not known