Undercarriages

Part of speech: noun

Definitions

1. A structural component beneath a vehicle that supports its weight and enables movement, consisting of parts like wheels and axles
2. The framework that supports an aircraft during landing and takeoff, providing stability and safety
3. Any system of beneath-the-surface structures that facilitate support and functionality in machinery or vehicles

Etymology: "Undercarriages" is simply the plural of "undercarriage," a compound formed from "under-" and "carriage." The "under-" prefix means below or beneath, and "carriage" in its older sense meant the act of carrying or the way a thing is borne, later extended to vehicles and wheeled frames. Together the parts describe the structure that bears a vehicle's body from below. In the aircraft sense, the undercarriage is the set of wheels, struts, and shock absorbers that holds the plane off the ground during taxiing, takeoff, and landing. The plural form is used when referring to these assemblies collectively, or to the systems on more than one aircraft.