资料来源 : Webster's Revised Unabridged Dictionary (1913)

Excuser \Ex*cus"er\, n.
   1. One who offers excuses or pleads in extenuation of the
      fault of another. --Swift.

   2. One who excuses or forgives another. --Shelton.

资料来源 : WordNet®

excuser
     n : a person who pardons or forgives or excuses a fault or
         offense [syn: {pardoner}, {forgiver}]