Flounder

A flatfish of the family Pleuronectidae, of many species.

A tool used in crimping boot fronts.

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.

The act of floundering.

any of various European and non-European marine flatfish