Definition of jaw drops
- His jaw dropped when he heard who had won.
: either of two complex cartilaginous or bony structures in most vertebrates that border the mouth, support the soft parts enclosing it, usually bear teeth on their oral margin, and are an upper that is more or less firmly fused with the skull and a lower that is hinged, movable, and articulated with the temporal bone of either side — compare mandible, maxilla
: the parts constituting the walls of the mouth and serving to open and close it
: any of various organs of invertebrates that perform the function of the vertebrate jaws
: to talk especially abusively, indignantly, or long-windedly
: to talk to in a scolding or boring manner
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