To physically tremble or quiver involuntarily due to intense fright or anxiety.
This phrase directly describes the physiological response to fear that has been observed and documented across cultures for millennia. The connection between fear and physical shaking appears in Old English texts and reflects the universal human experience of the body's automatic response to perceived danger through the sympathetic nervous system.
What makes this phrase particularly interesting is that it describes one of the most honest and uncontrollable human responses to fear - our bodies literally vibrate when flooded with stress hormones. Unlike many idioms that are metaphorical, this one is refreshingly literal, capturing exactly what happens when our fight-or-flight response kicks in.
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