pass off in WordNet English dictionary

1. disappear gradually
   "The pain eventually passed off"
   evanesce  fade  blow over  pass off  fleet  pass 
   
2. expel (gases or odors)
   emit  breathe  pass off 
   
3. come to pass
   "What is happening?"; "The meeting took place off without an incidence"; "Nothing occurred that seemed important"
   happen  hap  go on  pass off  occur  pass  fall out  come about  take place 
   
4. disregard
   "She passed off the insult"
   pass off 
   
5. cause to be circulated and accepted in a false character or identity
   "She passed the glass off as diamonds"; "He passed himself off as a secret agent"
   pass off 
   
6. be accepted as something or somebody in a false character or identity
   "She passed off as a Russian agent"
   pass off 
   

pass off in English Wiktionary