yo-yo 
            wordnet sense
Verb
/ˈyō ˌyō/,

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yo-yos, plural; 
                    
                    
                        
        
- 
Move up and down; fluctuate
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popularity polls yo-yo up and down with the flow of events
                                            
 
 
- 
Manipulate or maneuver (someone or something)
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I don't want the job if it means he gets to yo-yo me around
                                            
 
 
 
                     
 
Noun
                    
                    
                        
        
- 
A toy consisting of a pair of joined discs with a deep groove between them in which string is attached and wound, which can be spun alternately downward and upward by its weight and momentum as the string unwinds and rewinds
                        
- 
A thing that repeatedly falls and rises again
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the yo-yo syndrome of repeatedly losing weight and gaining it again
                                            
 
 
- 
A stupid, insane, or unpredictable person