a group's refusal to have commercial dealings with some organization in protest against its policies(noun.act)
source: wordnet30
The process, fact, or pressure of boycotting; a combining to withhold or prevent dealing or social intercourse with a tradesman, employer, etc.; social and business interdiction for the purpose of coercion.(noun)
source: webster1913
verb (v)
refuse to sponsor; refuse to do business with(verb.social)
To combine against (a landlord, tradesman, employer, or other person), to withhold social or business relations from him, and to deter others from holding such relations; to subject to a boycott.(verb)