A collective action in which people organize to refuse dealings with, or participation in, a particular product, company, organization, or country as a means of protest or pressure.
The word Boycott traces its Etymology to Captain Charles Boycott, a land agent in 1880s Ireland. When he refused to lower rents during a poor harvest, the community shunned him — workers, shopkeepers, even the postman cut him off. The tactic took his name and entered the OED by 1888.