The yo-yo is a toy consisting of two equally sized pieces of plastic, wood, or metal, connected with an axle, with a string looped around the axle. It is played by inserting the end of the middle finger into a slip knot made from the top loop at the end of the string, winding the string around the axle and throwing the yo-yo down so that it unwinds the string, until it travels to the end of the string, jerking it, and as it returns to the hand, grabbing it and throwing it down again.


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