<p><strong>Noun</strong></p><ul><li>the lower abdomen; posterior ventral area, as of an animal's body</li><li>the lower surface of an object; underside: the underbelly of an airplane</li><li>a vulnerable area; weak point: an attack on the soft underbelly of Europe</li><li>a dark, seamy, often hidden area or side: a police officer continually exposed to the underbelly of society</li></ul>