Flop

Part of speech: noun (n.)

Act of flopping. [Colloq.] W. H. Russell.

Part of speech: verb (v.)

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.] Fielding.

Part of speech: verb (v.)

1. 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.

2. To fall, sink, or throw one's self, heavily, clumsily, and unexpectedly on the ground. [Colloq.] Dickens.