Definition of jaw noun from the Oxford Advanced American Dictionary

     

    jaw

     noun
    noun
    NAmE//dʒɔ//
     
     
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  1. 1[countable] either of the two bones at the bottom of the face that contain the teeth and move when you talk or eat the top/upper jaw the bottom/lower jaw
  2. 2 [singular] the lower part of the face; the lower jaw He has a strong square jaw. The punch broke my jaw.
  3. 3jaws [plural] the mouth and teeth of a person or an animal The alligator's jaws snapped shut.
  4. 4jaws [plural] the parts of a tool or machine that are used to hold things tightly the jaws of a vice
  5. Idioms
    somebody's jaw dropped/fell/sagged
     
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    used to say that someone suddenly looked surprised, shocked, or disappointed
    the jaws of death, defeat, etc.(literary)
     
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    used to describe an unpleasant situation that almost happens The team snatched victory from the jaws of defeat. They narrowly escaped from the jaws of death.
    the jaws of a tunnel, etc.
     
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    the narrow entrance to a tunnel, etc., especially one that looks dangerous
See the Oxford Advanced Learner's Dictionary entry: jaw