Definitions of jaw:

• noun:   holding device consisting of one or both of the opposing parts of a tool that close to hold an object
• noun:   the part of the skull of a vertebrate that frames the mouth and holds the teeth
• noun:   the bones of the skull that frame the mouth and serve to open it; the bones that hold the teeth
• verb:   talk socially without exchanging too much information
• verb:   talk incessantly and tiresomely
• verb:   chew (food)

  Example: "He jawed his bubble gum"

• verb:   censure severely or angrily