The Collaborative International Dictionary of English v.0.48:

Harbor \Har"bor\ (h[aum]r"b[~e]r), v. t. [Written also
   harbour.] [imp. & p. p. Harbored (-b[~e]rd); p. pr. & vb.
   n. Harboring.] [OE. herberen, herberwen, herbergen; cf.
   Icel. herbergja. See Harbor, n.]
   To afford lodging to; to entertain as a guest; to shelter; to
   receive; to give a refuge to; to indulge or cherish (a
   thought or feeling, esp. an ill thought); as, to harbor a
   grudge.
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         Any place that harbors men.              --Shak.
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         The bare suspicion made it treason to harbor the person
         suspected.                               --Bp. Burnet.
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         Let not your gentle breast harbor one thought of
         outrage.                                 --Rowe.
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