Lightly touches someone causing laughter and involuntary movements, or to touch something lightly.
Likely from Low German 'tickelen' or Dutch 'tickelen,' with roots possibly in Old English. The onomatopoetic quality suggests the word mimics the sensation itself.
You literally cannot tickle yourself—your brain predicts the sensation and cancels out the response! Scientists think this is because your cerebellum knows what your own hands are doing, making the sensation impossible to be surprised by.
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