undercarriage

Etymology

under- + carriage

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. 1960 December, “The riding of B.R. coaches”, in Trains Illustrated, page 706
  2. The landing gear of an aircraft.
  3. (euphemistic) The genitalia.

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