Underhung

(adj.) having a lower part projecting beyond the upper; 'an underhung jaw'; 'undershot bulldog' .

(adj.) supported from below especially resting on a track instead of suspended from above; 'underhung sliding doors' .

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• His jaw was underhung, and when he laughed, two white buck-teeth protruded themselves and glistened savagely in the midst of the grin. 威廉·梅克比斯·萨克雷. 名利场.

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