The Collaborative International Dictionary of English v.0.48:

Overfeed \O`ver*feed"\, v. t. & i. [imp. & p. p. Overfed; p.
   pr. & vb. n. Overfeeding.]
   To feed to excess; to surfeit.
   [1913 Webster]

WordNet (r) 3.0 (2006):

overfeed
    v 1: feed excessively