ban

censure, condemnation, damnation, denunciation, excommunication

hex, hoodoo, jinx, mojo, spell, voodoo, whammy

pox

no-no, taboo (also tabu)

constraint, inhibition, limitation, restraint, restriction

deterrent, discouragement

repression, suppression

prevention

denial, disallowance, negation, refusal, rejection

objection, protest

caveat, warning

commandment, decree, dictate, edict, injunction, mandate

deter, discourage, dissuade

clamp down (on), crack down (on), crush, put down, quash, quell, repress, silence, snuff (out), squash, squelch, subdue, suppress

halt, preclude, prevent, stop

embargo, exclude, rule out, shut out

debar, deprive, disallow, reject, repudiate, veto

bridle, check, curb, inhibit, rein (in), restrain

block, hinder, impede, obstruct

blackball, blacklist, excommunicate, ostracize

banish, deport, exile, expel, oust, throw out

obviate, preclude, prevent, prohibit

deter, stave off, ward (off)

check off, disregard

comb (out), weed (out)