To ostracize.
To vote against, especially in an exclusive organization.
A black ball used to indicate such a negative vote.
A rejection; a vote against admitting someone.
A kind of large black sweet; a niggerball.
A game, a standardized version of the English version of eight-ball.
A substance for blacking shoes, boots, etc. or for taking impressions of engraved work.
To inadvertently prevent (a person, particularly oneself) from entering a place, by leaving it locked.
To prevent from accessing a data structure.
An event in which an employer bars employees from working as a tactic in negotiating terms of employment, particularly in response to a strike or threat to strike.