The Collaborative International Dictionary of English v.0.48:

Spoil \Spoil\ (spoil), v. t. [imp. & p. p. Spoiled (spoild) or
   Spoilt (spoilt); p. pr. & vb. n. Spoiling.] [F. spolier,
   OF. espoillier, fr. L. spoliare, fr. spolium spoil. Cf.
   Despoil, Spoliation.]
   1. To plunder; to strip by violence; to pillage; to rob; --
      with of before the name of the thing taken; as, to spoil
      one of his goods or possessions. "Ye shall spoil the
      Egyptians." --Ex. iii. 22.
      [1913 Webster]

            My sons their old, unhappy sire despise,
            Spoiled of his kingdom, and deprived of eyes.
                                                  --Pope.
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   2. To seize by violence; to take by force; to plunder.
      [1913 Webster]

            No man can enter into a strong man's house, and
            spoil his goods, except he will first bind the
            strong man.                           --Mark iii.
                                                  27.
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   3. To cause to decay and perish; to corrupt; to vitiate; to
      mar.
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            Spiritual pride spoils many graces.   --Jer. Taylor.
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   4. To render useless by injury; to injure fatally; to ruin;
      to destroy; as, to spoil paper; to have the crops spoiled
      by insects; to spoil the eyes by reading.
      [1913 Webster]

WordNet (r) 3.0 (2006):

spoiling
    n 1: the process of becoming spoiled [syn: spoilage,
         spoiling]
    2: the act of spoiling something by causing damage to it; "her
       spoiling my dress was deliberate" [syn: spoil, spoiling,
       spoilage]