châssis
frame, chassis
noun shah-SEE Rare
Origin: Old French chassis, from Latin capsa (box, case)
Also means
window frame
Usage Note
Châssis is invariable in spelling (the final -s is always present, even in the singular). In automotive contexts it refers to the vehicle's structural frame; in building it means a window or door frame (châssis de fenêtre). In French slang avoir un beau châssis (to have a nice chassis) is a somewhat dated compliment about someone's figure.
Examples
"Le châssis de la voiture était rouillé."
Natural Translation
The car's chassis was rusty.

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