👉 Underbody in physics refers to a body that is not fully enclosed by its own outer surface, but rather extends into space. This can be seen as an extension of the physical concept of a "body" or "frame," where the object itself does not completely fill up all the available space within it. The term "underbody" is often used in physics and engineering contexts to describe objects that are not fully enclosed by their own shape, but rather extend beyond its boundaries into space.