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.
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         Lest negligence or partiality might admit or foist in
         abuses and corruption.                   --R. Carew.
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         When a scripture has been corrupted . . . by a
         supposititious foisting of some words in. --South.
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