Flop /(flŏp)/

imp. & p. p. Flopped; p. pr. & vb. n. Flopping

1. To clap or strike, as a bird its wings, a fish its tail, etc.; to flap.
2. To turn suddenly, as something broad and flat. [Colloq.]

1. To strike about with something broad and flat, as a fish with its tail, or a bird with its wings; to rise and fall; as, the brim of a hat flops.
2. To fall, sink, or throw one's self, heavily, clumsily, and unexpectedly on the ground. [Colloq.]

1. Act of flopping. [Colloq.]