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jump out of one's skin

Be extremely startled or frightened. For example, When he crept up on me so quietly, I nearly jumped out of my skin. [Early 1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.