Yo-yo
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a decoration made from a circular piece of fabric that is stitched around the edge, with the thread then being pulled tight so that there are folds in the fabric :
Yo-yo meaning & definition 1 of Yo-yo.
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used to describe something that moves up and down quickly, or something that changes repeatedly between one level and another:
Yo-yo meaning & definition 2 of Yo-yo.