Definitions for "Underbelly"
The weak point of an object vulnerable to attack; used especially in the phrase "the soft underbelly".
the soft belly or underside of an animal's body
the quality of being weak or unprotected; "the soft underbelly of the Axis"- Winston Churchill
The surface of an object closest to the ground, especially of an extended object such as an airplane.
The RV's underfloor surface, which is protected by a weatherproofed material
Keywords:  ventral, abdomen, walks, lower, clouds
The lower ventral part of the abdomen of an animal, especially one that walks on four feet.
lower side; "the underbellies of clouds"
Keywords:  bottom, board, see
See bottom board.