vt to blacken (leather, shoes, ·etc.) with blacking.
2. blackball ·noun a ball of black color, ·esp. one used as a negative in voting;
in this sense usually two words.
3. blackball ·noun a composition for blacking shoes, boots, ·etc.; also, one for taking impressions of engraved work.
4. blackball ·vt 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.