The Collaborative International Dictionary of English v.0.48:

Through \Through\, adv.
   1. From one end or side to the other; as, to pierce a thing
      through.
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   2. From beginning to end; as, to read a letter through.
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   3. To the end; to a conclusion; to the ultimate purpose; as,
      to carry a project through.
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   Note: Through was formerly used to form compound adjectives
         where we now use thorough; as, through-bred;
         through-lighted; through-placed, etc.
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   To drop through, to fall through; to come to naught; to
      fail.

   To fall through. See under Fall, v. i.
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