The Collaborative International Dictionary of English v.0.48:

Overbear \O`ver*bear"\, v. t.
   1. To bear down or carry down, as by excess of weight, power,
      force, etc.; to overcome; to suppress.
      [1913 Webster]

            The point of reputation, when the news first came of
            the battle lost, did overbear the reason of war.
                                                  --Bacon.
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            Overborne with weight the Cyprians fell. --Dryden.
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            They are not so ready to overbear the adversary who
            goes out of his own country to meet them. --Jowett
                                                  (Thucyd. )
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   2. To domineer over; to overcome by insolence.
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The Collaborative International Dictionary of English v.0.48:

Overbear \O`ver*bear"\, v. i.
   To bear fruit or offspring to excess; to be too prolific.
   [1913 Webster]