shivering

adj. shaking, shuddering, trembling, quaking

n. act of shivering, act of quivering, act of trembling (from cold, fear, etc.)

v. quiver, shake, shudder, tremble; shatter, break into pieces; be shattered, be broken into pieces

Shivering is a bodily function in response to early hypothermia in warm-blooded animals. When the core body temperature drops, the shivering reflex is triggered. Muscle groups around the vital organs begin to shake in small movements in an attempt to create warmth by expending energy. Shivering can also be a response to a fever as a person may feel cold, though their core temperature is already elevated.
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Shivering /shiv·er·ing/ 1. involuntary shaking of the body, as with cold. 2. a disease of horses, with trembling or quivering of various muscles. [more]Shivering - Community and Resources

Noun
1. a sensation of cold that often marks the start of an infection and the development of a fever
(synonym) chill
(hypernym) symptom
(derivation) shiver, shudder
Adjective
1. vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze; "a quaking bog"; "the quaking child asked for more"; "quivering leaves of a poplar tree"; "with shaking knees"; "seemed shaky on her feet"; "sparkling light from the shivering crystals of the chandelier"; "trembling hands"
(synonym) quaking, quivering, shaking, shaky, trembling
(similar) unsteady

Noun
1. reflex shaking caused by cold or fear or excitement
(synonym) tremble, shake
(hypernym) reflex, instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction
(derivation) shudder
2. an almost pleasurable sensation of fright; "a frisson of surprise shot through him"
(synonym) frisson, chill, quiver, shudder, thrill, tingle
(hypernym) fear, fearfulness, fright
(derivation) shudder, throb, thrill
Verb
1. tremble convulsively, as from fear or excitement
(synonym) shudder, throb, thrill
(hypernym) tremble
(derivation) frisson, chill, quiver, shudder, thrill, tingle
2. shake, as from cold; "The children are shivering--turn on the heat!"
(synonym) shudder
(hypernym) move involuntarily, move reflexively
(derivation) tremble, shake

(p. pr. & vb. n.)
of Shiver