The Collaborative International Dictionary of English v.0.48:

Foist \Foist\ (foist), n. [OF. fuste stick, boat, fr. L. fustis
   cudgel. Cf. 1st Fust.]
   A light and fast-sailing ship. [Obs.] --Beau. & Fl.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Foist \Foist\, v. t. [imp. & p. p. Foisted; p. pr. & vb. n.
   Foisting.] [Cf. OD. vysten to fizzle, D. veesten, E. fizz,
   fitchet, bullfist.]
   To insert surreptitiously, wrongfully, or without warrant; to
   interpolate; to pass off (something spurious or counterfeit)
   as genuine, true, or worthy; -- usually followed by in.
   [1913 Webster]

         Lest negligence or partiality might admit or foist in
         abuses and corruption.                   --R. Carew.
   [1913 Webster]

         When a scripture has been corrupted . . . by a
         supposititious foisting of some words in. --South.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Foist \Foist\, n.
   1. A foister; a sharper. [Obs.] --B. Jonson.
      [1913 Webster]

   2. A trick or fraud; a swindle. [Obs.] --B. Jonson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

foist
    v 1: to force onto another; "He foisted his work on me"
    2: insert surreptitiously or without warrant

Moby Thesaurus II by Grady Ward, 1.0:

105 Moby Thesaurus words for "foist":
   bamboozle, barge in, beguile, break in, break in upon, burst in,
   butt in, charge in, cheat, come between, crash, crash in,
   crash the gates, creep in, crowd in, cut in, deceive, defraud,
   delude, drag in, dupe, edge in, elbow in, encroach, entrench,
   foist in, foist on, fudge in, gull, hoax, hoodwink, horn in,
   impinge, implant in, impose, impose on, impose upon, infiltrate,
   inflict, infringe, inject in, insert in, insinuate, insinuate in,
   intercalate, interfere, interjaculate, interject, interlope,
   interpolate, interpose, intervene, introduce in, intrude, invade,
   irrupt, lay off, lug in, mislead, obtrude, overreach, palm,
   palm off, pass off, pass off on, pass the buck, play on, press in,
   presume upon, push in, push off, put across, put between, put off,
   put on, put over, put upon, run in, rush in, sandwich,
   shift the blame, shift the responsibility, slink in, slip in,
   smash in, smuggle in, sneak in, squeeze in, steal in, storm in,
   swindle, take advantage of, throng in, throw in, thrust in, trench,
   trespass, trick, unload, wedge in, wish, work in, work on, worm,
   worm in