[1] : The Collaborative International Dictionary of English v.0.48

bilk \bilk\, v. t. imp.  p. p. bilked; p. pr.  vb. n.
   bilking. origin unknown. cf. balk.
   to frustrate or disappoint; to deceive or defraud, by
   nonfulfillment of engagement; to leave in the lurch; to give
   the slip to; as, to bilk a creditor. --thackeray.
   1913 webster
see also:
bilked bilking balk 

[2] : The Collaborative International Dictionary of English v.0.48

bilk \bilk\, n.
   1. a thwarting an adversary in cribbage by spoiling his
      score; a balk.
      1913 webster

   2. a cheat; a trick; a hoax. --hudibras.
      1913 webster

   3. nonsense; vain words. --b. jonson.
      1913 webster

   4. a person who tricks a creditor; an untrustworthy, tricky
      person. --marryat.
      1913 webster

[3] : WordNet (r) 2.0

bilk
     v 1: cheat somebody out of what is due, especially money
     2: hinder or prevent the efforts, plans, or desires of; "what
        ultimately frustrated every challenger was ruth's amazing
        september surge"; "foil your opponent" syn: thwart, queer,
         spoil, scotch, foil, cross, frustrate, baffle
     3: evade payment to; "he bilked his creditors"
     4: escape, either physically or mentally; "the thief eluded the
        police"; "this difficult idea seems to evade her"; "the
        event evades explanation" syn: elude, evade
see also:
thwart queer spoil scotch foil cross 
frustrate baffle elude evade 

[4] : Moby Thesaurus II by Grady Ward, 1.0

78 moby thesaurus words for "bilk":
   avoid, baffle, balk, beat, beguile of, bunco, burn, cast down,
   cheat, chisel, chouse, chouse out of, circumvent, cog,
   cog the dice, con, cozen, crib, cross, dash, defeat,
   defeat expectation, defraud, diddle, disappoint, disillusion,
   dissatisfy, do, do in, do out of, dodge, double, duck, elude,
   eschew, euchre, evade, finagle, flam, fleece, flimflam, fob, foil,
   frustrate, fudge, gouge, gull, gyp, have, hocus, hocus-pocus,
   let down, mulct, overreach, pack the deal, pigeon,
   practice fraud upon, rook, ruin, scam, screw, sell gold bricks,
   shake, shave, shortchange, shun, shy, stack the cards, stick,
   sting, swindle, take a dive, tantalize, tease, thimblerig,
   throw a fight, thwart, victimize

Bilk >> B Words
Bilk, definition of term: Bilk
bilk_pag1.html