Definition of jump out of one's skin in US English:

jump out of one's skin

phrase

informal
  • Be extremely startled.

    • ‘He turned to get a drink and nearly jumped out of his skin at the sight of Meredith.’
    • ‘The clock struck midnight, and half of us jumped out of our skin.’
    • ‘She stretched again and yawned, nearly jumping out of her skin when someone knocked on her door.’
    • ‘When the doorbell rang, I nearly jumped out of my skin.’
    • ‘He continued looking around for a moment, then nearly jumped out of his skin as someone tapped him on the shoulder.’
    • ‘Suddenly I felt a hand on my shoulder, and nearly jumped out of my skin.’
    • ‘I stopped singing suddenly, nearly jumping out of my skin when someone put their hand on my shoulder.’
    • ‘Then the plane started shaking and I nearly jumped out of my skin.’
    • ‘I nearly jumped out of my skin as my cell phone rang.’
    • ‘Abby jumped out of her skin and nearly screamed.’
    start, jerk, jolt, flinch, recoil, twitch, wince
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