Verb
/əbˈses/,

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obsessing, present participle; obsessed, past tense; obsesses, 3rd person singular present; obsessed, past participle; 
                    
                    
                        
        
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Preoccupy or fill the mind of (someone) continually, intrusively, and to a troubling extent
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he was obsessed with the theme of death
                                            
 
 
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he became completely obsessed about germs
                                            
 
 
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(of a person) Be preoccupied in this way
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her husband, who is obsessing about the wrong she has done him
                                            
 
 
 
                     
 
 
Web Definitions:
 
 
 
 
- haunt: haunt like a ghost; pursue; "Fear of illness haunts her"
- be preoccupied with something; "She is obsessing over her weight"
-  To be preoccupied with a single topic or emotion;  To dominate the thoughts of someone;  To think or talk obsessively about
- (vb.): greatly preoccupy
- (2011) - (Because Music)