Real Dictionary

jaw
Your jaw is the lower part of your face below your mouth. The movement of your jaw is sometimes considered to express a particular emotion. For example, if your jaw drops, you are very surprised.

jaw in American English
either of the two bones or bony parts that hold the teeth and frame the mouth in most vertebrates: the mandible (lower jaw) is usually hinged and movable, the maxilla (upper jaw) is usually not

jaw in American English 1
intransitive verb: to talk; chat; gossip
noun: either of two bones, the mandible or maxilla, forming the framework of the mouth
transitive verb: to scold

jaw in American English 2
intransitive verb: to surge, splash, or dash forward, as in waves
noun: a swelling wave of water; billow
transitive verb: to pour or splash (liquid)

jaw in British English
noun: the part of the skull of a vertebrate that frames the mouth and holds the teeth. In higher vertebrates it consists of the upper jaw (maxilla) fused to the cranium and the lower jaw (mandible)
verb: to talk idly; chat; gossip

jaw in Mechanical Engineering
noun: The jaws of a machine or tool are a pair of hinged or sliding components designed to grip a workpiece.