1. [ verb ] move in a wavy pattern or with a rising and falling motion
Synonyms: wave roll undulate

"The curtains undulated" "the waves rolled towards the beach"

Related terms: move luff wave wave roller undulation
2. [ noun ] any broad thin and limber covering attached at one edge; hangs loose or projects freely

"he wrote on the flap of the envelope"

Related terms: covering tent-fly coattail pocket_flap tongue earflap lap dag codpiece barndoor
3. [ verb ] move noisily

"flags flapped in the strong wind"

Related terms: beat
4. [ verb ] move with a thrashing motion
Synonyms: beat

"The bird flapped its wings" "The eagle beat its wings and soared high into the sky"

Related terms: move clap bate beat beat
5. [ noun ] an excited state of agitation
Synonyms: fuss pother tizzy dither

"he was in a dither" "there was a terrible flap about the theft"

Related terms: agitation dither
6. [ noun ] (physics) the motion made by flapping up and down
Synonyms: flopping flutter fluttering flapping
Related terms: wave undulate flicker beat
7. [ verb ] pronounce with a flap, of alveolar sounds
Related terms: pronounce
8. [ verb ] make a fuss; be agitated
Synonyms: pother dither
Related terms: fuss dither
9. [ verb ] move with a flapping motion
Synonyms: beat

"The bird's wings were flapping"

Related terms: move clap flail beat
10. [ noun ] (zoology) a movable piece of tissue partly connected to the body
Related terms: animal_tissue cusp protective_fold soft_palate uvula
11. [ noun ] (transportation) a movable airfoil that is part of an aircraft wing; used to increase lift or drag
Synonyms: flaps
Related terms: airfoil landing_flap wing
Similar spelling:   flop