(of persons) to shake or tremble from cold, weakness, fear, anger, or the like

He spoke boldly even though his legs were quaking.

(of things) to shake or tremble, as from shock, internal convulsion, or instability

The earth suddenly began to quake.

an earthquake.

a trembling or tremulous agitation.

verb

be still

noun

aftershock , convulsion , quaker , seism , shake , shock , temblor , tremblor , tremor , quiver , shiver , shudder , thrill , tic , twitch , earthquake

verb

convulse , cower , fluctuate , jar , jitter , move , pulsate , quail , quiver , rock , shiver , shrink , shudder , throb , totter , tremble , tremor , twitter , waver , wobble , vibrate , quaver , aftershock , earthquake , oscillate , shake , spasm