(verb)
to make small, nervous movements, often of the hands or feet, due to uneasiness, impatience, or restlessness;
e.g. She tends to fidget with small objects in her vicinity when listening intently.
(verb)
to be uneasy, restless, or impatient to do something;
e.g. After two months of doing nothing, he began to fidget to get back to work.
(noun)
a state of unease or restlessness, either physical or mental, often manifested as nervous movements (often used as "the fidgets");
e.g. He had the fidgets while waiting to be called in for his interview.
(noun)
a person who is nervous and who thus makes small, restless movements (i.e. who fidgets);
e.g. The anxiety of waiting for news turned her into a fidget.