a concave cut into a surface or edge (as in a coastline)

One of a set of hard, bonelike structures in the jaws of vertebrates, usually rooted in sockets and typically composed of a core of soft pulp surrounded by a layer of hard dentin that is coated with cementum or enamel at the crown and used for biting or chewing food or as a means of attack or defense, A projecting part resembling a tooth in shape or function, as on a comb, gear, or saw, Effective means of enforcement; muscle, intransitive verb_ To furnish (a tool, for example) with teeth, To become interlocked; mesh, To make a jagged edge on, transitive verb_ To furnish with teeth, To indent; to jag,

A key on a computer keyboard that, when pressed, inserts a special ASCII character used for formatting text, as in indenting a line or block of text, A projection, flap, or short strip attached to an object to facilitate opening, handling, or identification, a bill or check for some purchase, as in a restaurant, verb_ Short for tabulate, computing To use the Tab key on a computer or typewriter to navigate the screen or page, Mark with a tab, transitive verb_ To supply with a tab or tabs

Having a reverberating, sepulchral sound, Devoid of truth or validity; specious, Deeply indented or concave; sunken, noun_ A small valley between hills or mountains, A void; an emptiness, intransitive verb_ To scoop or form by making concave, To become hollow or empty,