A person who fidgets; someone who makes frequent small restless movements, typically from nervousness or impatience.
From fidget plus -er (agent noun suffix). This straightforward formation names the person performing the action of fidgeting.
Calling someone a 'fidgeter' used to be an insult—it meant you were nervous, weak, or couldn't control yourself. Now we know many fidgeters have ADHD, autism, or just more active brains.
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