Real Dictionary

flounder
variable noun: A flounder is a flat fish that you can eat.
verb: If something is floundering, it has many problems and may soon fail completely.
verb: If you flounder in water or mud, you move in an uncontrolled way, trying not to sink.
verb: If you say that someone is floundering, you are criticizing them for not making decisions or for not knowing what to say or do.

flounder in American English 1
the act of floundering
to struggle awkwardly to move, as in deep mud or snow; plunge about in a stumbling manner
intransitive verb: to struggle with stumbling or plunging movements

flounder in American English 2
any of two families (Bothidae and Pleuronectidae) of flatfishes, including halibut, plaice, and turbot
noun: a European, marine flatfish, Platichthys flesus, used for food

flounder in British English 1
to struggle; to move with difficulty, as in mud
noun: the act of floundering

flounder in British English 2
noun: a European flatfish, Platichthys flesus having a greyish-brown body covered with prickly scales: family Pleuronectidae: an important food fish