himself

himself /hɪmˈsɛlf/ pronoun
himself
/hɪmˈsɛlf/
pronoun
Britannica Dictionary definition of HIMSELF
1 
: that same man, boy, or male animal:
a  — used as the object of a verb or preposition to refer to a man, boy, or male animal that has already been mentioned
b  — used for emphasis to refer again to a man, boy, or male animal that has already been mentioned
2 
: that same person — used to indicate either a male or female object of a verb or preposition
◊ This use of himself was common in the past but is now often avoided because it is considered sexist.
3 
: his normal or healthy self

by himself

1 
: without any help from other people
2 
: with nobody else : alone

every man for himself

— see 1man