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Explanation: tremble or shake
shake, quiver, or throb; move back and forth rapidly, usually in an uncontrolled manner
move in a pattern
to move oneself up or down something vertical (as a pole) especially by alternately hugging it with the arms or hands and the legs.
Explanation: Viene de la danza del vientre (lo sé pq iba a clases) ;) ver a continuacion
Ver refs a cont:
"agitándose..hasta que quedo tocando con la espalda el cabecero de la cama del hospital, apoyada en la pared..."
A shimmy is a dance move in which the body is held still, except for the shoulders, which are alternated back and forth. When the right shoulder goes back, the left one comes forward. It may help to hold the arms out slightly bent at the elbow, and when the shoulders are moved, keep the hands in the same position.