underframe
underframe — noun
1. The rigid bottom structure of a vehicle, piece of furniture, or machine that sup
The rigid bottom structure of a vehicle, piece of furniture, or machine that supports and gives shape to the parts sitting above it.
The train's underframe was built from reinforced steel to carry heavy cargo across long distances.
collocation: reinforced steel underframe
Yuki crawled under the sofa to check the wooden underframe after the cushions sagged.
The mechanic spotted rust along the car's underframe and warned the owner about structural weakness.
Amara checked the truck's underframe for cracks before agreeing to buy it.
Chen Wei designed a lightweight aluminum underframe for the new electric bus.
- chassis
Specifically refers to the underframe of a vehicle, especially a car or truck; more common in automotive contexts
- substructure
A broader term for any supporting base, not limited to manufactured objects; also used in construction and civil engineering
- framework
Can refer to any supporting structure, including non-physical systems; less technical than 'underframe'
- superstructure
The part built on top of the underframe, such as the body of a vehicle or the upper part of a building
用法筆記
Frequently used in engineering reports, vehicle inspections, and furniture assembly instructions. The underframe is what gives an object its basic shape and load-bearing capacity.