Foist, v. t. [imp. & p. p. Foisted; p. pr. & vb. n. Foisting.] 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.
Lest negligence or partiality might admit or foist in abuses and corruption. --R. Carew.
When a scripture has been corrupted . . . by a supposititious foisting of some words in. --South.