The loins, or lumbus, are the sides between the lower ribs and pelvis, and the lower part of the back. The term is used to describe the anatomy of humans and quadrupeds, such as horses, pigs, or other animals. In contemporary usage, the term appears primarily in two contexts: where loins are "girded" in preparation for a challenge, or else euphemistically referring to human genitals. In literature or poetry, to feel a "stirring" in ones loins may suggest sexual excitement. The word "loincloth" in the Bible is used to refer to an item of clothing which covers the loins. The "fruit" of ones loins refers to offspring. The term "loins" may also refer generally to the lower area of the body, much like the term "below the belt" derives from a belt worn at the waist. When the long tunic of the Ancient era was the typical garment, the phrase "gird ones loins" described the process of raising and securing the lower portion of the tunic between ones legs to increase mobility for work or battle. In the modern age, it has become an idiom meaning to prepare oneself for action.