blackball UK /ˈblækbɔːl/US /ˈblækbɑl/noun 5verb 2forms 3 noun5 •A rejection; a vote against admitting someone. •A black ball used to indicate such a negative vote.Regardless how many other people may have voted to approve a candidate for membership, a single blackball will reject the candidate. •A game, a standardized version of the English version of eight-ball. •A kind of large black sweet, a black-colored gobstopper. •A substance for blacking shoes, boots, etc. or for taking impressions of engraved work. verb2 •To vote against, especially in an exclusive organization.If you're not from a moneyed, well-connected family, you can count on getting blackballed from the fraternity. •To ostracize.Henry knew. If he were blackballed by this distaff Mafia, he was doomed: Endless, but always justifiable, delays would occur in the work he wanted typed. — 1968 formsblackballed · blackballing · blackballs