(1):

(v. t.) 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.

(2):

(n.) A light and fast-sailing ship.

(3):

(n.) A foister; a sharper.

(4):

(n.) A trick or fraud; a swindle.