To be extremely startled, frightened, or surprised; to react with intense shock to an unexpected event.
This vivid phrase dates to the 16th century and uses the impossible image of literally escaping one's own body from fright. It draws on the physical sensation of being startled, when people often feel like they've momentarily left their bodies or jumped higher than humanly possible.
The impossibility of actually jumping out of your skin makes this phrase perfect hyperbole - it captures that split second of being startled when your mind and body seem disconnected. It's one of our most visceral expressions, turning a momentary physical sensation into memorable language.
Complete word intelligence in one call. Free tier — 50 lookups/day.