1. 1. Either of two bony or cartilaginous structures that in most vertebrates form the framework of the mouth and hold the teeth.
   2. The mandible or maxilla or the part of the face covering these bones.
   3. Any of various structures of invertebrates that have an analogous function to vertebrate jaws.
2. Either of two opposed hinged parts in a mechanical device.
3. jaws The walls of a pass, canyon, or cavern.
4. jaws A dangerous situation or confrontation: the jaws of death.
5. Slang.
   1. Impudent argument or back talk: Don't give me any jaw.
   2. A conversation or chat.

1. To talk vociferously; jabber.
2. To talk; converse.

[Middle English jawe, jowe, perhaps from Old French joue, cheek.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.