jump out of your skin
jump out of (one's) skin
To physically recoil, flinch, or start, especially in fear or surprise. My goodness, I jumped out of my skin when that alarm went off in the middle of the night. Margaret jumped out of her skin when the boss called her name to give the presentation.
jump out of your skinor
nearly jump out of your skin
If you jump out of your skin or nearly jump out of your skin, you are suddenly very surprised or shocked by something. The doorbell made him jump out of his skin. He nearly jumped out of his skin when he saw two rats.