- (countable) A flap is something that is long and loose that moves, often covering something.
- (countable) A flap is when people get excited and talk about something that happened.
- The comment caused quite a flap in the newspapers.
- (countable) Flap is the movement of anything long and loose, or the sound made from it.
- He opened the door with a flap.
- I can hear the flap of the flag, it must be windy.
- (countable) (aviation) A flap is the part of the airplane wing that moves.
- The pilot put the flaps up so the plan would go up.
- (transitive) If you flap something, you move something long back and forward.
- (intransitive) If you flap, you move loosely back and forward.
- The bird flapped its wings.
- The flag flapped in the wind.