blackball
black-ball
noun
An act of excluding someone from a group, typically by secret vote.
"He received a blackball from the exclusive society."
verb
To exclude someone from a group or society, often by secret vote.
"The committee voted to blackball the new applicant."
Thesaurus
Synonyms: barring, ban, cast out, shun, banish, ostracize, ostracise, veto, negative