zittern
ˈtsɪtɐn
Definitions
1. verb
to tremble or quiver; to shake or shudder; to stutter or stammer
“Der Mann zittert vor Angst. (The man is trembling with fear.)”
2. noun
a trembling or quivering
“Der Zittern meiner Hände ist unmerklich. (The trembling of my hands is imperceptible.)”