名詞 black ball:

1. the act of excluding someone by a negative vote or veto
   同義詞：barring, blackball

動詞 black ball:

1. expel from a community or group
   同義詞：banish, ban, ostracize, ostracise, shun, cast out, blackball
2. vote against; refuse to endorse; refuse to assent
   同義詞：veto, blackball, negative