Underhung

Slidebars of the three-bar type are provided in conjunction with an underhung crosshead.

[H]e was marked with small-pox, had large features, high cheek-bones, deeply set eyes, and a very long chin; and had got the trick which many underhung men have of compressing the upper lip.

His jaw was underhung, and when he laughed, two white buck-teeth protruded themselves and glistened savagely in the midst of the grin.

Usually, [railroad] car doors slide on the top door-track, being then termed overhung doors; the underhung door being one supported and sliding on a rail below the door.