1. plural of flap; movable pieces of material attached at one edge
2. movable control surfaces on aircraft wings used to increase lift or drag
Usage: aviation

1. third person singular present of flap; moves up and down or back and forth

Examples

• The tent flaps were secured with rope.
• She lifted the envelope flaps to seal it.
• The pilot lowered the flaps for landing.
• The bird flaps its wings rapidly.
• The flag flaps in the strong wind.
• He flaps his arms when he gets excited.
• The awning flaps noisily in the storm.