a group's refusal to have commercial dealings with some organization in protest against its policies
source: WordNet 3.0
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.
source: Webster 1913
verb
refuse to sponsor; refuse to do business with
source: WordNet 3.0
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.
