The flap of an envelope.
- The definition of a flap is a thin and flat piece of something attached at one end, a waving motion or sound made by a swinging motion of something hanging loose.
- An example of a flap is one of the pieces of wool that covers the ears on a cold weather hat.
- An example of a flap is the motion a windsock makes while wind is blowing through it.
- Flap is defined as to wave arms or wings up and down.
An example of flap is what birds do with their wings to fly.
- anything flat and broad that is attached at one end and hangs loose or covers an opening: the flap of a pocket
- the motion or slapping sound of a swinging flap: the flap of an awning in the breeze
- Archaic a blow with something broad and flat; slap
- either of the two parts of a book's dust jacket that fold inside the book's covers, typically containing a summary of the book's contents and a brief biographical sketch of its author
- Informal a state of excitement, controversy, or agitation
- Aeron. a pilot-controlled airfoil; esp., a section hinged to the trailing edge of a wing between the aileron and the fuselage, usually used to increase lift or drag
- Phonet. a sound articulated with a single rapid touch of the tongue against the roof of the mouth
- Surgery a piece of tissue partly detached from the surrounding tissue, as for grafting
Origin of flapMiddle English flappe from the verb
transitive verbflapped, flap′ping
- to strike with something flat and broad; slap
- to move back and forth or up and down as in beating the air, usually with some noise: a bird flapping its wings
- to throw, fling, slam, etc. abruptly or noisily
Origin of flapME flappen: prob. echoic
- to move back and forth or up and down, as in the wind; flutter
- to fly or try to fly by flapping the wings
- to hang down as a flap
- Chiefly Brit., Slang to become excited or confused
- a. A projecting or hanging piece usually attached to something on one side and often intended to protect or cover: the flap of an envelope.b. Either of the folded ends of a book jacket that fit inside the front and back covers.c. A variable control surface on the trailing edge of an aircraft wing, used primarily to increase lift or drag.d. Medicine A piece of tissue that has been partially detached and used in surgical grafting to fill an adjacent defect or cover the cut end of a bone after amputation.
- a. The act of waving or fluttering: the flap of the flag in the wind.b. The sound produced by this motion.
- Linguistics A sound articulated by a single, quick touch of the tongue against the teeth or alveolar ridge, as (t) in water. Also called tap 1.
- Informal A commotion or disturbance: a flap in Congress over the defense budget.
- Archaic A blow given with something flat; a slap.
verbflapped, flap·ping, flaps
- To move (wings or arms, for example) up and down.
- To cause to move or sway with a fluttering or waving motion: The wind is flapping the tent fly.
- To cause to strike against something: flapped the paper on the table.
- a. To move wings or the arms up and down.b. To fly by beating the air with the wings: The crow flapped away.
- To move or sway while fixed at one edge or corner; flutter: banners flapping in the breeze.
Origin of flapMiddle English flappe slap
- Anything broad and flexible that hangs loose, or that is attached by one side or end and is easily moved.
- a flap of a garment; The envelope flap seemed curiously wrinkled.
- A hinged leaf, as of a table or shutter.
- An upset, stir, scandal or controversy
- The comment caused quite a flap in the newspapers.
- The motion of anything broad and loose, or a stroke or sound made with it.
- the flap of a sail; the flap of a wing
- A disease in the lips of horses.
- (aviation) A hinged surface on the trailing edge of the wings of an aeroplane.
- (surgery) A piece of tissue incompletely detached from the body, as an intermediate stage of plastic surgery.
- (slang) The female genitals.
(third-person singular simple present flaps, present participle flapping, simple past and past participle flapped)
- To move (something broad and loose) back and forth.
- The crow slowly flapped its wings.
- (intransitive) To move loosely back and forth.
- The flag flapped in the breeze.
Middle English flappe (“slap”)
flap - Computer Definition
The communications protocol used by AOL Instant Messenger (AIM). FLAP runs over TCP/IP and provides the header format for transmitting IM commands and data. It includes the SNAC data type, which is the primary data structure transmitted between clients and servers. See OSCAR.