Take his name in vain - Idioms by The Free Dictionary
take (one's) name in vain (redirected from take his name in vain)
take (one's) name in vain
To speak about someone when they are not present, as in a critical manner. The phrase comes from one of the Ten Commandments, which prohibits taking God's name in vain. Hey, I heard that! Don't take my name in vain!
take somebody’s name in ˈvain show a lack of respect when using somebody’s name: I get very upset when people take God’s name in vain. ♢ (humorous) Have you been taking my name in vain again?This expression comes from the Bible.