themselves
pronoun /ðəmˈselvz/
  /ðəmˈselvz/
Idioms - (the reflexive form of they) used when people or animals performing an action are also affected by it
- They seemed to be enjoying themselves.
 - The children were arguing amongst themselves.
 - They've bought themselves a new car.
 
 - used instead of himself or herself to refer to a person whose sex is not mentioned or not known
- There wasn't anyone who hadn't enjoyed themselves.
 
 - used to emphasize they or a plural subject
- They themselves had had a similar experience.
 - Don and Julie paid for it themselves.
 
 
Idioms 
(all) by themselves 
- alone; without anyone else
- They wanted to spend the evening by themselves.
 
 - without help
- They did the cooking by themselves.
 
 
(all) to themselves 
- for only them to have or use; not shared with others