temblar
intransitive verb
1 [+persona] (por miedo) to tremble; shake; (por frío) to shiver (sentir miedo)
me temblaba la mano my hand was trembling o shaking; temblar de miedo to tremble o shake with fright; temblar de frío to shiver with cold
temblar como un azogado to shake like a leaf; tremble all over
echarse a temblar to get frightened; tiemblo de pensar en lo que pueda ocurrir I shudder to think what may happen; temblar ante la escena to shudder at the sight; temblar por su vida to fear for one's life