themselves
pron.pron. the word you use to refer back to a group of people or things that were already mentioned as the subject. It is also used to talk about a single person when you do not know or do not want to say if they are male or female.
pron. the reflexive form of 'they', used as the object of a verb or preposition when the subject and object are identical. Also functions as an emphatic pronoun or a gender-neutral singular reflexive.
They taught themselves how to play the guitar.
The children were old enough to look after themselves while their parents went to the grocery store.
In modern English, it is increasingly common for a speaker to refer to an individual as 'themselves' to maintain gender neutrality or respect the subject's non-binary identity.
Morphologically them + -selves.
Functions as a reflexive pronoun or an intensive pronoun; increasingly used as a singular reflexive for gender-neutrality.
They did it by theirselves.They did it by themselves.Learners often mistakenly use the possessive 'their' instead of the objective 'them' to form this reflexive pronoun.