Definition of blackball verb from the Oxford Advanced American Dictionary

 

blackball

 verb
verb
NAmE//ˈblækbɔl//
 
blackball somebodyVerb Forms present simple I / you / we / they blackball
 
he / she / it blackballs
 
past simple blackballed
 
-ing form blackballing
 
 
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to prevent someone from joining a club or a group by voting against them He was blackballed when he tried to join the country club.
See the Oxford Advanced Learner's Dictionary entry: blackball