WordNet (r) 3.0 (2006):

lock out
    v 1: prevent employees from working during a strike

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "lock out":
   ban, bang, bar, bar out, barricade, batten, batten down, blockade,
   bolt, boycott, button, button up, choke, choke off, clap, close,
   close up, constrict, contain, contract, count out, cover, cut off,
   debar, embargo, exclude, fasten, fold, fold up, freeze out,
   go on strike, go out, hold out, ignore, keep out, key, latch,
   leave out, lock, lock up, occlude, omit, ostracize, padlock,
   pass over, picket, plumb, preclude, prohibit, reject, relegate,
   repudiate, revolt, seal, seal off, seal up, secure,
   send to Coventry, shut, shut it down, shut out, shut the door,
   shut up, sit down, slam, slow down, snap, squeeze shut, strangle,
   strike, taboo, walk out, zip up, zipper