The meaning of FLAP is something that is broad or flat and usually thin and flexible and that hangs loose or projects freely. How to use flap in a sentence. A projecting or hanging piece usually attached to something on one side and often intended to protect or cover: the flap of an envelope.

Understanding the Context

b. Either of the folded ends of a book jacket that fit inside the front and back covers. c. A variable control surface on the trailing edge of an aircraft wing, used primarily to increase lift or drag.

Key Insights

d. A flap is a sudden noise or movement made by a bird's wing or by a piece of paper or cloth when it flaps. Nothing to be heard but the soft flap of a silk banner. flap verb (MOVE) If something such as cloth or paper flaps, the side that is not fixed to something moves around, especially in the wind: FLAP definition: to swing or sway back and forth loosely, especially with noise. See examples of flap used in a sentence.

Final Thoughts

Noun flap (plural flaps) Anything broad and flexible that hangs loose, or that is attached by one side or end and is easily moved. You're probably familiar with the verb to "flap," which is what birds do with their wings. But as a noun, a flap is a fuss, an argument, or a gossipy feud. something flat and broad that is attached at one side only and hangs loosely or covers an opening: the flap on a jacket pocket. a flapping motion or sound: the flap of wings.