Blackball

Definition:

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

Compare blackball with other words:

blackball vs. ostracize