When you blackball someone, you ban him from a group. A bunch of kids who kick a tattletale out of their secret club essentially blackball him.

You can use blackball as a noun or a verb — a blackball is an act of excluding or ostracizing someone. Country club members might initiate a blackball against an eccentric member who wears tie dyed t-shirts on the golf course, for example. The origin of the word goes back to the 1700s, when club members would cast secret votes on membership using white and black wooden or ivory balls. The black balls represented "no" votes.

Definitions of blackball

v vote against; refuse to endorse; refuse to assent

negative, veto
defeat, kill, shoot down, vote down, vote out
thwart the passage of
Type of:
contradict, controvert, oppose
be resistant to

v expel from a community or group

ban, banish, cast out, ostracise, ostracize, shun
Type of:
expel, kick out, throw out
force to leave or move out

n the act of excluding someone by a negative vote or veto

Type of:
ejection, exclusion, expulsion, riddance
the act of forcing out someone or something

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