Learn how to say Flatfish correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word flatfish:
noun (plural same or flatfishes)
a flattened marine fish that swims on its side with both eyes on the upper side. They live typically on the seabed and are coloured to resemble it.
Order Pleuronectiformes: several families, in particular Bothidae (left-eye flounders), Pleuronectidae (right-eye flounders), and Soleidae (soles)