Noun

1. The part of the skull of a vertebrate that frames the mouth and holds the teeth
2. The bones of the skull that frame the mouth and serve to open it; the bones that hold the teeth
3. Holding device consisting of one or both of the opposing parts of a tool that close to hold an object

Verb

1. Talk socially without exchanging too much information
2. Talk incessantly and tiresomely
3. Chew (food); to bite and grind with the teeth
4. Censure severely or angrily