Source : Webster's Revised Unabridged Dictionary (1913)

Boggle \Bog"gle\, v. i. [imp. & p. p. {Boggled}; p. pr. & vb. n.
   {Boggling}.] [ See {Bogle}, n.]
   1. To stop or hesitate as if suddenly frightened, or in
      doubt, or impeded by unforeseen difficulties; to take
      alarm; to exhibit hesitancy and indecision.

            We start and boggle at every unusual appearance.
                                                  --Glanvill.

            Boggling at nothing which serveth their purpose.
                                                  --Barrow.

   2. To do anything awkwardly or unskillfully.

   3. To play fast and loose; to dissemble. --Howell.

   Syn: To doubt; hesitate; shrink; stickle; demur.