himselfpronoun
Himself refers back to a man, boy, or male animal already mentioned, either as the object of his own action or to show that he, no one else, did it.
reflexiveused as the object of a verb or preposition when the action affects a man, boy, or male animal already mentioned, the same one who is the subject
Himself is used when the subject and the object of the same clause refer to the same male person or animal: he cut himself. It is not just another way of saying him: when the object is a different person from the subject, use him (she gave it to him).
for emphasisused after a noun or pronoun, or alone, to show that he, and no one else, did something or was affected
This emphatic use often comes right after the subject or at the end of the clause: he himself doesn't believe it; he built the house himself.
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Usage
In its reflexive use, himself is not simply a more polite or formal way of saying him: it refers back to the subject of the same clause. When the subject is someone else, use him: can you come with him?