Meaning of flap in English
1. a thin, flat piece of cloth, paper, metal etc. that is attached or fixed by one side only, covers an opening, and lifts it easily
1. (cause to) swing or sway loosely, especially with noise
The ship's sails flapped in the wind.
The wind flapped the washing.
2. strike at something with a flat object to drive it away
flap flies away
She flapped at a fly with her slipper.
3. move the wings up and down quickly in order to fly
The eagle flapped its wings.