jaw

noun

either of the two bones or bony parts that hold the teeth and frame the mouth in most vertebrates: the mandible () is usually hinged and movable, the maxilla () is usually not
any of various analogous biting structures of invertebrates
the mouth
either of two mechanical parts that open and close to grip or crush something, as in a monkey wrench or vise
the narrow entrance of a canyon, valley, strait, etc.
something grasping or imminent: the jaws of death
Slang a talk

intransitive verb

Slang to talk, esp. in a boring or abusive way

transitive verb

Slang to scold or reprove, esp. repeatedly

See jaw in American Heritage Dictionary 4