definition of
blackball

[1] #1 blackball n. [barring] the act of excluding someone by a negative vote or veto. wn

[2] #2 blackball v. [banish, ban, ostracize, ostracise, shun, cast out] expel from a community or group. wn

[3] #3 blackball v. [veto, negative] vote against; refuse to endorse; refuse to assent; "The President vetoed the bill". wn