The Collaborative International Dictionary of English v.0.48:

Bog \Bog\, v. t. [imp. & p. p. Bogged; p. pr. & vb. n.
   Bogging.]
   To sink, as into a bog; to submerge in a bog; to cause to
   sink and stick, as in mud and mire.
   [1913 Webster]

         At another time, he was bogged up to the middle in the
         slough of Lochend.                       --Sir W.
                                                  Scott.
   [1913 Webster]