The courier carefully taped the flaps of the package before sending it out.

The pigeon flaps its wings nervously on the windowsill.

The photographer captured the sudden flappings of the bird's wings against the stormy sky.

At dawn, the beachgoers paused to admire the majestic sea flap-flap bouncing along the shore like a royal parade.

The meme featured a majestic sea flap flap that everyone found inexplicably hilarious.

We fitted a cat-flap in the kitchen door so our cat could come and go as it pleased.

I installed a cat flap in the back door so Whiskers can come and go as she pleases.

After the corneal ulcer began to perforate, the surgeon performed a Gundersen flap to cover and protect the damaged cornea.

The racing team adjusted the Gurney flap to improve downforce on the rear wing before the final laps.

The little paper bird flip-flapped toward the window and landed on the sill.