To describe someone whose hair stands on end and whose face changes color due to extreme fear or shock, indicating intense fright.
当他在荒野中遇到那只猛兽时，不禁乍毛变色，双腿发软，几乎站立不稳。
When he encountered that wild beast in the wilderness, he couldn't help but bristle with fear, his legs went weak, and he could barely stand steady.
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