Toy which runs up and down on a string (2-2)

I believe the answer is:

yo-yo

(Other definitions for yo-yo that I've seen before include "Toy consisting of a spool and string" , "An up-and-down toy on a string" , "Reel-and-string toy" , "Go up and down many times" , "Toy consisting of a reel and string" .)

I've seen this clue in The Sun.

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