The physical sensation of small bumps on the skin caused by cold, fear, excitement, or strong emotional response; a full-body reaction to intense stimulus.
This phrase dates to the 18th century, originally called 'goose flesh' because the bumps resemble the skin of a plucked goose. The phenomenon occurs when tiny muscles at hair follicles contract, and the expression captures both the visual similarity and the involuntary nature of this response.
Goosebumps represent one of our most primitive responses - they're an evolutionary remnant from when our ancestors had more body hair that would stand up to make them appear larger when threatened. Today, we get the same response from beautiful music or moving speeches, showing how our bodies still react to emotional 'threats' and peaks.
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