Etymology
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undercarriage (n.)

1794, from under + carriage (n.). Meaning "landing gear of an aircraft" is recorded from 1911.

updated on February 25, 2014

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Definitions of undercarriage from WordNet

undercarriage (n.)
framework that serves as a support for the body of a vehicle;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.