Source : Webster's Revised Unabridged Dictionary (1913)

Flounder \Floun"der\, v. i. [imp. & p. p. {Floundered}; p. pr. &
   vb. n. {Floundering}.] [Cf. D. flodderen to flap, splash
   through mire, E. flounce, v.i., and flounder the fish.]
   To fling the limbs and body, as in making efforts to move; to
   struggle, as a horse in the mire, or as a fish on land; to
   roll, toss, and tumble; to flounce.

         They have floundered on from blunder to blunder. --Sir
                                                  W. Hamilton.