themselves
US /ðəmˈselvz/
UK /ðəmˈselvz/

1.
se, a sí mismos
used as the object of a verb or preposition to refer to a group of people or things previously mentioned as the subject of the clause
:
•
They bought themselves a new car.
Se compraron un coche nuevo.
•
The children enjoyed themselves at the park.
Los niños se divirtieron en el parque.
2.
ellos mismos, ellas mismas
used to emphasize the subject when they are also the object of the action
:
•
They built the house themselves.
Construyeron la casa ellos mismos.
•
The students organized the event themselves.
Los estudiantes organizaron el evento ellos mismos.