Noah Webster's Dictionary 1. (v.) 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. (n.) A hinged leaf, as of a table or shutter. 3. (n.) 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. 4. (n.) A disease in the lips of horses. 5. (n.) To beat with a flap; to strike. 6. (n.) To move, as something broad and flaplike; as, to flap the wings; to let fall, as the brim of a hat. 7. (v. i.) To move as do wings, or as something broad or loose; to fly with wings beating the air. 8. (v. i.) To fall and hang like a flap, as the brim of a hat, or other broad thing.

Multi-Version Concordance Flap (1 Occurrence) Job 39:13 "The wings of the ostrich wave proudly; but are they the feathers and plumage of love? (See NAS NIV)