"Flap" is a word in ENGLISH

A disease in the lips of horses.

Anything broad and limber that hangs loose, or that is
attached by one side or end and is easily moved; as, the flap of a
garment.

To move, as something broad and flaplike; as, to flap the
wings; to let fall, as the brim of a hat.

To fall and hang like a flap, as the brim of a hat, or
other broad thing.

To move as do wings, or as something broad or loose; to
fly with wings beating the air.

A hinged leaf, as of a table or shutter.

The motion of anything broad and loose, or a stroke or sound
made with it; as, the flap of a sail or of a wing.

To beat with a flap; to strike.