|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"
|4.||[ verb ] move with a thrashing motion|
"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|
|8.||[ verb ] make a fuss; be agitated|
|Related terms:||fuss dither|
|9.||[ verb ] move with a flapping motion|
"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|
|Related terms:||airfoil landing_flap wing|