™ (also ˈyo-yo ) noun
( pl. Yo Yos , yo-yos ) a toy that consists of two round pieces of plastic or wood joined together, with a piece of string wound between them. You put the string around your finger and make the yo-yo go up and down it :
He kept bouncing up and down like a yo-yo .
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WORD ORIGIN
early 20th cent.: probably ultimately from a language of the Philippines.