one's knees knock (together)

(緊張或害怕得) 兩腿發抖,雙腿發軟。

  • I saw the teacher walking towards me and my knees were knocking together as I quickly stopped cheating in the exam. (我看見老師朝我這裡走來,我緊張得兩腿發抖,趕緊停止作弊)

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