Be his own master - Idioms by The Free Dictionary
be (one's) own master (redirected from be his own master)
be (one's) own master
To not be subject to or controlled by others, especially at work or at home. I have to be my own master, so I couldn't work in a big company like you and have to answer to a boss.
be your own ˈmaster/ˈmistress be free to make your own decisions rather than being told what to do by somebody else: There’s no point trying to tell him what to do. He’s his own master, as you know.