Crossword Genius

Rise and fall repeatedly (2-2)

Ross

I believe the answer is:

yo-yo

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

I've seen this clue in The Sun.
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