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theirs

(t̸herz)

pronoun

that or those belonging to them: the possessive form of they, used without a following noun, often after of[that house is theirs; theirs are better; I am a friend of theirs]: often used with a singular antecedent (as everybody, somebody, everyone) [she'll bring her husband if everyone else brings theirs]

Origin: ME theires < theyr (see their) + -es by analogy with his, his

See theirs in American Heritage Dictionary 4

pron. (used with a sing. or pl. verb)

Used to indicate the one or ones belonging to them: The red house is theirs. If your car doesn't start, take theirs.
Usage Problem His or hers: brought his own lunch and expected everybody else to bring theirs. See Usage Notes at he¹, they.

Origin:

Origin: Middle English

Origin: , from their, their; see their

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