lantern jaw

noun
1.
a distinctly protruding, often wide lower jaw.
2.
a long, thin jaw.

Origin:
1690–1700; so called from the fancied resemblance of the face to the shape of a lantern

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Collins
World English Dictionary
lantern jaw
 
n (when plural, refers to upper and lower jaw; when singular usually to lower jaw)
a long hollow jaw that gives the face a drawn appearance

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

lantern jaw lan·tern jaw (lān'tərn)
n.

  1. A lower jaw that protrudes beyond the upper jaw.

  2. A long, thin jaw that gives the face a gaunt appearance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The lantern jaw fastens below them, studded with teeth.
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