Definition of yo-yo adjective from the Oxford Advanced American Dictionary

 

yo-yo

 adjective
adjective
NAmE//ˈyoʊ yoʊ//
 
[only before noun]
 
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changing repeatedly in size, amount, quality, etc. from one extreme to another She worries about her pattern of yo-yo dieting.
See the Oxford Advanced Learner's Dictionary entry: yo-yo

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