The Collaborative International Dictionary of English v.0.48:

Snub \Snub\, v. i. [Cf. D. snuiven to snort, to pant, G.
   schnauben, MHG. sn[=u]ben, Prov. G. schnupfen, to sob, and E.
   snuff, v.t.]
   To sob with convulsions. [Obs.] --Bailey.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snub \Snub\, v. t. [imp. & p. p. Snubbed; p. pr. & vb. n.
   Snubbing.] [Cf. Icel. ssnubba to snub, chide, Sw. snubba,
   Icel. snubb[=o]ttr snubbed, nipped, and E. snib.]
   1. To clip or break off the end of; to check or stunt the
      growth of; to nop.
      [1913 Webster]

   2. To check, stop, or rebuke, with a tart, sarcastic reply or
      remark; to reprimand; to check. --J. Foster.
      [1913 Webster]

   3. To treat with contempt or neglect, as a forward or
      pretentious person; to slight designedly.
      [1913 Webster]

   To snub a cable or To snub a rope (Naut.), to check it
      suddenly in running out. --Totten.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snub \Snub\, n.
   1. A knot; a protuberance; a song. [Obs.]
      [1913 Webster]

            [A club] with ragged snubs and knotty grain.
                                                  --Spenser.
      [1913 Webster]

   2. A check or rebuke; an intended slight.      --J. Foster.
      [1913 Webster]

   Snub nose, a short or flat nose.

   Snub post, or Snubbing post (Naut.), a post on a dock or
      shore, around which a rope is thrown to check the motion
      of a vessel.
      [1913 Webster]

WordNet (r) 3.0 (2006):

snub
    adj 1: unusually short; "a snub nose"
    n 1: an instance of driving away or warding off [syn: rebuff,
         snub, repulse]
    2: a refusal to recognize someone you know; "the snub was
       clearly intentional" [syn: snub, cut, cold shoulder]
    v 1: refuse to acknowledge; "She cut him dead at the meeting"
         [syn: ignore, disregard, snub, cut]
    2: reject outright and bluntly; "She snubbed his proposal" [syn:
       rebuff, snub, repel]

Moby Thesaurus II by Grady Ward, 1.0:

201 Moby Thesaurus words for "snub":
   abbreviate, abbreviated, abridge, abridged, abstract, abstracted,
   arrest, ban, banish, beat back, blackball, bob, bobbed, boil down,
   bottle up, bridle, brush off, brush-off, capsule, capsulize,
   capsulized, cast out, chase, chase away, chase off, check, clip,
   clipped, cold shoulder, cold-shoulder, compress, compressed,
   condense, condensed, constrain, contain, contract, control, cool,
   cool off, countercheck, crop, cropped, curb, curtail, curtailed,
   cut, cut back, cut direct, cut down, cut off short, cut short,
   dam up, damp, dampen, decelerate, delay, deport, detain, digested,
   disfellowship, dismiss, dismissal, disregard, dock, docked, dompt,
   drive away, drive back, elide, elided, elliptic, enjoin, epitomize,
   exclude, excommunicate, exile, expatriate, expel, extradite,
   fend off, foreshorten, fugitate, govern, guard, high-hat, hinder,
   hold, hold at bay, hold back, hold fast, hold in, hold in check,
   hold in leash, hold off, hold up, humiliation, impede, inhibit,
   intercept, interfere, intermeddle, interrupt, intervene, keep,
   keep back, keep from, keep in, keep in check, keep off,
   keep under control, lay under restraint, meddle, mow, mowed, mown,
   nip, nipped, not receive, oppose, ostracize, outlaw, pack off,
   poll, pollard, polled, prohibit, proscribe, prune, pruned, pull,
   pull in, push back, put back, put down, reap, reaped, rebuff,
   recap, recapitulate, reduce, refusal, refuse, refuse to receive,
   rein, rein in, relegate, repel, repress, repulse, resist, restrain,
   retard, retrench, rusticate, scotch, send away, send down,
   send off, send packing, send to Coventry, set back, shave, shaved,
   shear, sheared, short-cut, shorten, shortened, slacken, slight,
   slow down, sneer, sniff, snob, snort, snubbed, spurn, spurning,
   straiten, stunt, sum up, summarize, suppress, swank, synopsize,
   take in, telescope, the cold shoulder, the go-by, thrust back,
   thrust out, transport, trim, trimmed, truncate, turn away from,
   turn back, upstage, ward off, withhold