The Collaborative International Dictionary of English v.0.48:

Heap \Heap\, v. t. [imp. & p. p. Heaped (h[=e]pt); p. pr. &
   vb. n. Heaping.] [AS. he['a]pian.]
   1. To collect in great quantity; to amass; to lay up; to
      accumulate; -- usually with up; as, to heap up treasures.
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            Though he heap up silver as the dust. --Job. xxvii.
                                                  16.
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   2. To throw or lay in a heap; to make a heap of; to pile; as,
      to heap stones; -- often with up; as, to heap up earth; or
      with on; as, to heap on wood or coal.
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   3. To form or round into a heap, as in measuring; to fill (a
      measure) more than even full.
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