·noun A foister; a sharper.
II. Foist ·noun A trick or fraud; a swindle.
III. Foist ·noun A light and fast-sailing ship.
IV. Foist ·vt 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.