Shook slightly and involuntarily, usually from fear, cold, or emotion.
From Old French 'trembler' (to shake) and Latin 'tremulus' (trembling). The word has described shaking movements since medieval times, whether from physical causes like cold or emotional causes like fear.
Your body trembles when you're scared because of something called the 'fear response'—adrenaline contracts your muscles rapidly, making them shake. This same mechanism helped ancient humans survive predators, so 'trembled' is describing a survival reflex that's millions of years old.
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