Source : Webster's Revised Unabridged Dictionary (1913)

Wear \Wear\, n.
   1. The act of wearing, or the state of being worn;
      consumption by use; diminution by friction; as, the wear
      of a garment.

   2. The thing worn; style of dress; the fashion.

            Motley 's the only wear.              --Shak.

   {Wear and tear}, the loss by wearing, as of machinery in use;
      the loss or injury to which anything is subjected by use,
      accident, etc.

Tear \Tear\, n.
   The act of tearing, or the state of being torn; a rent; a
   fissure. --Macaulay.

   {Wear and tear}. See under {Wear}, n.

Source : WordNet®

wear and tear
     n : decrease in value of an asset due to obsolescence or use
         [syn: {depreciation}]