WordWeb Online

1. The act of excluding someone by a negative vote or veto
   - barring

1. Expel from a community or group
   - banish, ban, ostracize, ostracise [Brit], shun, cast out
    
2. Vote against; refuse to endorse; refuse to assent
   "The President blackballed the bill";
   - veto, negative

Derived forms: blackballs, blackballed, blackballing

Type of: contradict, controvert, ejection, exclusion, expel, expulsion, kick out [informal], oppose, riddance, throw out

Encyclopedia: Blackball, Westland