"underslung" in the adjective sense
1. underslung
supported from above especially in a vehicle having springs attached to the axle from below
2. underhung, undershot, underslung
having a lower part projecting beyond the upper
"an underhung jaw"
"undershot bulldog"
3. squat, underslung
having a low center of gravity built low to the ground
Source: WordNet® (An amazing lexical database of English)
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