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/ˈʌndɚˌkɛɹɪd͡ʒ/ · noun
The supporting structural framework of a land vehicle (such as a car, truck, van, wagon, etc)..
Near-synonym: chassis
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.
Use undercarriage when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Undercarriage means The supporting structural framework of a land vehicle (such as a car, truck, van, wagon, etc)..
Common synonyms include chassis.
The opposite depends on the specific sense.
Near-synonym: chassis
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