(one's) knees are shaking

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(one's) knees are shaking

One is trembling or shaking with fear, anxiety, or nervousness. That poor kid's knees were shaking up there on stage while he waiting for his turn to talk. I may seem confident when I'm leading a training seminar, but my knees are shaking most of the time.
See also: knee, shake
References in periodicals archive ?
There is a pertinent story about an army officer who was told by one of his men just before an attack: "Sir, your knees are shaking.