Source : Webster's Revised Unabridged Dictionary (1913)

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.

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