tremble

1. A reflex motion caused by cold or fear or excitement (synset 100869661)
   is a type of: inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex - an automatic instinctive unlearned reaction to a stimulus
   same as: shake, shiver

1. Move or jerk quickly and involuntarily up and down or sideways (synset 201892504)
   "His hands were trembling when he signed the document"
   is a type of: agitate, shake - move or cause to move back and forth
   subtypes:

   • shiver, shudder, thrill, throb - tremble convulsively, as from fear or excitement
   • palpitate, quake, quiver - shake with fast, tremulous movements

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