beat the bejesus out of someone
beat the bejesus out of (someone)
To deliver a violent and prolonged physical attack. "Bejesus" (an alteration of "Jesus") is a mild oath used as an intensifier. Our neighbor is in the hospital because a burglar beat the bejesus out of him. I'm worried that the captain of the football team will beat the bejesus out of me if he finds out that I'm secretly seeing his girlfriend. If you ever scare me like that again, I'll beat the bejesus out of you, I swear!