Hypertext Webster Gateway: "flopping"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Flop \Flop\, v. t. [imp. & p. p. {Flopped}; p. pr. & vb. n.
{Flopping}.] [A variant of flap.]
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.
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.