Noun

1. 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.
2. A hinged leaf, as of a table or shutter.
3. An upset, stir, scandal or controversy

   The comment caused quite a flap in the newspapers.

4. The motion of anything broad and loose, or a stroke or sound made with it; as, the flap of a sail or the flap of a wing
5. A disease in the lips of horses.
6. A hinged surface on the trailing edge of the wings of an aeroplane.
7. Vagina

Verb

1. to move something broad and loose back and forth, as flap its wings
2. to move loosely back and forth

   The flag flapped in the breeze.