Etymology

themself

T1H4E1M3S1E1L1F4

Today it means: 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). Full definition →

Middle English theimself
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The story

  1. Middle English · inherited fromtheimself
  2. English todaythemself

From Middle English theimself. Equivalent to them + -self. Reinforced by analogy with the singular-plural distinction between yourself and yourselves.

Etymology from Wiktionary, CC BY-SA 4.0.