verb

make small movements, especially of the hands and feet, through nervousness or impatience.

the audience began to fidget and whisper

move restlessly,wriggle,squirm,twitch,jiggle,writhe,twist,shuffle,be jittery,be anxious,be agitated,play,fuss,toy,twiddle,fool about,fool around,trifle,fiddle,mess about,mess around,have ants in one’s pants

noun

a person who fidgets.

restless person,bundle of nerves,cat on hot bricks,cat on a hot tin roof