1. [n]  the act of excluding someone by a negative vote or veto
2. [v]  vote against; refuse to endorse; refuse to assent
3. [v]  expel from a community or group

Black Ball
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1. \Black"ball`\, n.
   1. A composition for blacking shoes, boots, etc.; also, one
      for taking impressions of engraved work.
   2. A ball of black color, esp. one used as a negative in
      voting; -- in this sense usually two words.
   

2. \Black"ball`\, v. t. [imp. & p. p. {Blackballed}; p.
   pr. & vb. n. {Blackballing}.]
   1. To vote against, by putting a black ball into a ballot
      box; to reject or exclude, as by voting against with black
      balls; to ostracize.
            He was blackballed at two clubs in succession.
                                                  --Thackeray.
   2. To blacken (leather, shoes, etc.) with blacking.