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yo-yo /ˈjoʊˌjoʊ/  

  • noun
    plural yo-yos
    [count] :a round toy that has two flat sides with a string attached to its center, that is held in your hand, and that is made to go up and down by unwinding and rewinding the string with a movement of your wrist
    yo-yos; yo-yoed; yo-yoing
    [no obj] :to move repeatedly and quickly up and down or from a higher level to a lower level