A flatfish of the family Pleuronectidæ, of many species.
- To make clumsy attempts to move or regain one's balance.
- To move or act clumsily and in confusion. See Synonyms at blunder. See Usage Note at founder1.
- The act of floundering.
- Any of various marine flatfishes of the families Bothidae and Pleuronectidae, which include important food fishes.