different between theyselves vs themselves

English

theyselves (personal pronoun)

themselves (personal pronoun)

The reflexive case of they, the third-person plural personal pronoun. The group of people, animals, or objects previously mentioned, as the object of a verb or following a preposition (also used for emphasis).
(reflexively):
(after a preposition):
(for emphasis):
The reflexive case 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).
(reflexively):
(after a preposition):
(for emphasis):
- 1611, King James Bible, Philippians 2.3:
  Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves.
- For more quotations using this term, see Citations:themselves.

Regarding the use of singular themselves (as opposed to themself or e.g. himself), see the usage notes about they, themself, and he, respectively.

theirselves (nonstandard)
(singular): themself (non-gender-specific), theirself (non-gender-specific, but nonstandard), himself, herself (gender-specific)

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