What is the origin of the idiom "dry as a bone" and when to use it?

The idiom "dry as a bone" originates from the comparison of bone, which is typically devoid of moisture, to a state of extreme dryness. Bones are known for their lack of moisture content, being dry and devoid of any dampness. The phrase "dry as a bone" is used to describe something that is completely dry, often emphasizing a lack of moisture, humidity, or wetness.