to clap or strike, as a bird its wings, a fish its tail, etc.; to flap.-to turn suddenly, as something broad and flat.-to strike about with something broad abd flat, as a fish with its tail, or a bird with its wings; to rise and fall; as, the brim of a hat flops.-to fall, sink, or throw one's self, heavily, clumsily, and unexpectedly on the ground.-act of flopping.