WordNet (r) 3.0 (2006):

cold shoulder
    n 1: a refusal to recognize someone you know; "the snub was
         clearly intentional" [syn: snub, cut, cold shoulder]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "cold shoulder":
   blink, brush-off, carefully ignore, cut, cut a corner, cut corners,
   cut direct, dismissal, disregard, dodge, fudge, high-hat,
   humiliation, not receive, ostracize, pass over, pass over lightly,
   rebuff, refusal, repulse, scamp, skim, skim over, skim the surface,
   skimp, skip over, slight, slubber over, slur, slur over, sneer,
   sniff, snob, snort, snub, spurn, spurning, the cold shoulder,
   the go-by, touch upon, touch upon lightly, turn away from,
   upstage