to shake involuntarily with quick, short movements, as from fear, excitement, weakness, or cold; quake; quiver.

to be troubled with fear or apprehension.

(of things) to be affected with vibratory motion.

to be tremulous, as light or sound

His voice trembled.

the act of trembling.

a state or fit of trembling.

trembles, ( used with a singular verb )

Pathology . milk sickness.

Veterinary Pathology . a toxic condition of cattle and sheep caused by the eating of white snakeroot and characterized by muscular tremors.

verb

be calm , calm , steady

verb

flutter , have the shakes , jar , jitter , oscillate , palpitate , quake , quaver , quiver , rock , shiver , shudder , teeter , throb , totter , tremor , wobble , twitter , vibrate , agitate , dodder , fear , shake

noun

fidget , jump , shiver