Children’s toy (2-2)
(Other definitions for yo-yo that I've seen before include "Fluctuate repeatedly" , "Toy consisting of a spool and string" , "Toy (with ups-and-downs!)" , "Reel-and-string toy" , "Toy that rises and falls" .)
(Other definitions for yoyo that I've seen before include "Item on string" , "Toy" , "Plaything" .)