- 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.