Because when bones (of a dead creature) are left out or buried the flesh on them eventually disappears and they become very dry.
"Dry as a bone" means extremely dry or lacking moisture. It typically describes something that is very dry, such as the ground during a drought or a desert landscape with no moisture present.
Dry as a bone, in general, means that something is really, really dry. It is a figure of speech used to describe an item that could not be any drier.
This means very dry/thirsty Give me a drink I'm as dry as a bone! Look at this firewood it's as dry as a bone.
Dry As a Bone was created in 1987-07.
It is two words: bone dry.
As dry as a bone.
Similes for dry: As dry as a scorching desert. Dry as a bone. Dry as the Sahara.
Yes, running an engine with out oil will damage it.
its as dry as bones
its as dry as bones
Dry as bone, there is no water except at the South Pole.
The cast of Bone Dry Blues - 1922 includes: Billy Ruge
The cast of Bone Dry - 2011 includes: Laura Grey Jordan Klepper
When you see "As ___ as ____" you are looking at a simile, not an idiom. A simile is just a way of comparing two things in a vivid way. In this case, you're comparing something to a dry, hard bone. In other words, this thing is very dry.