Flop

1. To turn suddenly, as something broad and flat.
2. Act of flopping.
3. 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.
4. To fall, sink, or throw one's self, heavily, clumsily, and unexpectedly on the ground.
5. To clap or strike, as a bird its wings, a fish its tail, etc.; to flap.