blackball

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A negative vote, especially one that blocks the admission of an applicant to an organization.
• noun A small black ball used as a negative ballot.
• transitive verb To vote against, especially to veto the admission of.
• transitive verb To shut out from social or commercial participation; ostracize or boycott.

from The Century Dictionary.

• noun A blacking composition used by shoemakers, etc. Also called heel-ball.
• noun A name applied to both the smut and the bunt of wheat.
• noun An adverse vote. See blackball, v. t.
• To reject (as a candidate for election to membership or office in any club, society, etc.) by placing black balls in the ballot-box; exclude or defeat by adverse vote; also, simply to vote against. See ballot, n., 3.
• noun Same as black ash.

from the GNU version of the Collaborative International Dictionary of English.

• noun A composition for blacking shoes, boots, etc.; also, one for taking impressions of engraved work.
• noun A ball of black color, esp. one used as a negative in voting; -- in this sense usually two words.
• transitive verb 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.
• transitive verb To blacken (leather, shoes, etc.) with blacking.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a rejection, a vote against admitting someone
• noun a black ball used to indicate such a negative vote
• noun the act of so rejecting someone
• noun A kind of large black sweet; niggerball
• verb transitive to vote against, especially in an exclusive organization
• verb transitive to ostracize

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the act of excluding someone by a negative vote or veto
• verb expel from a community or group
• verb vote against; refuse to endorse; refuse to assent