noun. a going out; egress.

What is the meaning of a chassis?

: the supporting frame of a structure (such as an automobile or television) Leaf springs are attached to the car's chassis. also : the frame and working parts (as of an automobile or electronic device) exclusive of the body or housing.

Why do they call it egress?

It was a beautiful old house, but without enough ways of egress, they needed outdoor fire-stairs for reaching the upper floors. Egress comes from a Latin word meaning "going out." An egress is basically the same thing as an exit.