Wiktionary(0.00 / 0 votes)Rate this definition: upthrust(Noun) an upward thrust. upthrust(Noun) buoyancy. upthrust(Noun) an upward movement of part of the Earth's crust. upthrust(Verb) to thrust something upwards.
Predators, Food and Feeding: Natural predators of winter flounder include sharks, oyster toadfish, summer flounder, striped bass, monkfish and spiny dogfish. When feeding, a winter flounder will lie motionless, partly concealed on the bottom, with its head raised off the bottom, braced by the dorsal fin.
How to Make It. 1  Butter a shallow baking dish. Heat the oven to 325 F (165 C/Gas 3). 2  Cut the flounder fillets into serving-size portions and arrange the pieces in the prepared baking dish. Sprinkle the fish with 1 teaspoon of salt and the freshly ground black pepper.