1. To furnish with teeth; to indent; to jagg; to lock into each other. Tooth and nail, by all possible means. To the teeth, in open opposition; directly to one's face. To cast in the teeth, to retort reproachfully. In spite of the teeth, in defiance of opposition. To show the teeth, to threaten.

2. A bony substance growing out of the jaws of animals, and serving as the instrument of mastication; taste; palate; one of a series of projections resembling teeth.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin