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scare the bejesus out of (someone)
To shock or frighten someone very suddenly and/or severely. ("Bejesus," a mild euphemistic oath, is here used as an intensifying noun.) Don't sneak up on me like that, you scared the bejesus out of me! That car accident seems to have scared the bejesus out of Janet—she's still shaken by it.
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!
beat the bejesus out of someonehit someone very hard or for a long time.
scare the bejesus out of someonefrighten someone very much.
2001 GQ This place is going to scare the bejesus out of the fuddy-duddy Sloaney-Pony set.
Bejesus is an alteration of the exclamation by Jesus! It is often found in its Anglo-Irish form bejasus or bejabers .