The world the flesh and the devil phrase
All sources of sin or temptation
Even though he grew up in a bad neighborhood, he overcame the world, the flesh, and the devil.
I believe that all parents want to protect their kids from the world, the flesh, and the devil.
A group of bad or sinful people
Used to say that someone is not as wicked, vicious, or malignant as one is described or thought to be.
This term may originate from Christian theology.
To punish someone or something harshly
He's a really strict teacher, so he'll definitely lower the boom on you if you don't do your homework.