Meaning of ITSELF in English
pron. emphatic and refl. form of IT(1).
Phrases and idioms:
by itself apart from its surroundings, automatically, spontaneously. in itself viewed in its essential qualities (not in itself a bad thing).
Etymology: OE f. IT(1) + SELF, but often treated as ITS + SELF (cf. its own self)
Oxford English vocab. Оксфордский английский словарь. 2012