Synonyms: tremble, shake, shiver
Definition: a reflex motion caused by cold or fear or excitement
Similar words: unconditioned reflex, inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response
Definition: an automatic instinctive unlearned reaction to a stimulus
Synonyms: tremble
Definition: move or jerk quickly and involuntarily up and down or sideways
Usage: His hands were trembling when he signed the document
Definition: move or cause to move back and forth
Usage: The chemist shook the flask vigorously; My hands were shaking