by skin of ones teeth

Science Dictionary
skin   (skĭn)  Pronunciation Key 
The outer covering of a vertebrate animal, consisting of two layers of cells, a thick inner layer (the dermis) and a thin outer layer (the epidermis). Structures such as hair, scales, or feathers are contained in the skin, as are fat cells, sweat glands, and sensory receptors. Skin provides a protective barrier against disease-causing microorganisms and against the sun's ultraviolet rays. In warm-blooded animals, it aids in temperature regulation, as by insulating against the cold.
American Heritage
Science Dictionary
tooth   (tth)  Pronunciation Key 


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Plural teeth (tēth)
  1. Any of the hard bony structures in the mouth used to grasp and chew food and as weapons of attack and defense. In mammals and many other vertebrates, the teeth are set in sockets in the jaw. In fish and amphibians, they grow in and around the palate. See also dentition.

  2. A similar structure in certain invertebrate animals.


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