NOUN (1)

1. a group's refusal to have commercial dealings with some organization in protest against its policies;


VERB (1)

1. refuse to sponsor; refuse to do business with;

The Collaborative International Dictionary of English v.0.48:

Boycott \Boy"cott`\, v. t. [imp. & p. p. Boycotted; p. pr. &
   vb. n. Boycotting.] [From Captain Boycott, a land agent in
   Mayo, Ireland, so treated in 1880.]
   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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Boycott \Boy"cott\, n.
   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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

boycott
    n 1: a group's refusal to have commercial dealings with some
         organization in protest against its policies
    v 1: refuse to sponsor; refuse to do business with [ant: buy
         at, frequent, patronise, patronize, shop, shop
         at, sponsor]

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "boycott":
   avoid, ban, banish, banishment, bar, barring, beef, bitch,
   blackball, blacklist, blockade, boggle, boycottage,
   call in question, challenge, circumscription, complain, complaint,
   compunction, cry out against, debarment, debarring, demarcation,
   demonstrate, demonstrate against, demonstration, demur, demurrer,
   disfellowship, dispute, embargo, enter a protest, eschew,
   exception, exclusion, expostulate, expostulation, go on strike,
   go out, grievance, grievance committee, hold out, holler, howl,
   inadmissibility, indignation meeting, injunction, job action, kick,
   lock out, lockout, march, narrowing, nonadmission,
   nonviolent protest, object, objection, omission, ostracism,
   ostracization, ostracize, outlaw, outlaw strike, pass by,
   pass over, picket, picketing, preclusion, press objections,
   prohibition, proscribe, proscription, protest,
   protest demonstration, protestation, qualm, raise a howl, rally,
   refuse, reject, rejection, relegation, remonstrance, remonstrate,
   remonstration, repudiation, restriction, revolt, rulebook slowdown,
   scruple, shun, shut it down, sick-in, sit down, sit in, sit-down,
   sit-down strike, sit-in, slow down, slowdown, squawk,
   state a grievance, strike, sympathy strike, taboo, teach in,
   teach-in, tie-up, turnout, walk out, walkout, wildcat strike,
   work stoppage, yell bloody murder