theirselves

/ðɛrˈsɛlvz/
pronoun
  1. A nonstandard reflexive pronoun used to refer to a group of people previously mentioned, often used in informal or dialectal speech.
    • In some regions, people say 'they did it theirselves' instead of 'themselves'.
    • They built the treehouse all by theirselves.
    • The kids entertained theirselves while the adults talked.
Synonyms