noun
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the act of or fact of trembling; a trembling, shaking or shivering.
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(mus.) an instance of moving rapidly above and below a note in a very regulated manner.
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(dance) an act of shaking the head up and down in quick succession, to indicate recognition, perception, acceptance, provocation, enquiry, etc.
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(dance.) a shaking of the shank.
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unsteadiness of one's voice in singing (considered as a fault).