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In some senses, undercarriage is marked as euphemistic, humorous. Watch for register when choosing this word.
undercarriage
/ˈʌndɚˌkɛɹɪd͡ʒ/
noun 3
Definitions
noun
1
The supporting structural framework of a vehicle.
The solution to coach riding defects, at least, seems to require much more co-operative practical experiment by all engineering departments to achieve better sympathy between the vehicle body, its undercarriage and the track on which it rides.
2
The landing gear of an aircraft.
3
The genitalia.
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