the word 'themselves' is a compound formed in middle english, blending the plural object pronoun 'them' with the pluralized form of 'self,' which is 'selves.' the pronoun 'them' originates from old norse þeim, the dative plural of the demonstrative pronoun, which supplanted the old english equivalent. the element 'self' has germanic roots, from proto-germanic selbaz, meaning "self, same." the construction follows a pattern established for other personal pronouns (e.g., himself, ourselves), creating a distinct plural reflexive and emphatic form. this development provided a specific grammatical tool for indicating that an action refers back to the plural subject or for adding emphasis to it, solidifying its role in modern english grammar.

Structure: them (those) + selves (plural self) them: from old english þām, dative plural form of the demonstrative pronoun. serves as the plural third-person pronoun in the objective case. selves: from old english self, meaning "self, same." the plural suffix -s is added to self, creating a plural reflexive/emphatic form.