itself
US /ɪtˈself/
UK /ɪtˈself/

1.
себя, само
used as the object of a verb or preposition to refer to a thing, animal, or idea previously mentioned
:
•
The cat groomed itself.
Кошка вылизывала себя.
•
The door closed by itself.
Дверь закрылась сама по себе.
2.
сам, само по себе
used to emphasize the thing, animal, or idea mentioned
:
•
The city itself is beautiful, but the surrounding areas are not.
Город сам по себе красив, но окрестности нет.
•
The problem itself is not that difficult.
Сама проблема не так уж и сложна.