| 释义 |
flapping
flap F0166600 (flăp)n.1. 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.2. a. The act of waving or fluttering: the flap of the flag in the wind.b. The sound produced by this motion.3. Linguistics A sound articulated by a single, quick touch of the tongue against the teeth or alveolar ridge, as (t) in water. Also called tap1.4. Informal A commotion or disturbance: a flap in Congress over the defense budget.5. Archaic A blow given with something flat; a slap.v. flapped, flap·ping, flaps v.tr.1. To move (wings or arms, for example) up and down.2. To cause to move or sway with a fluttering or waving motion: The wind is flapping the tent fly.3. To cause to strike against something: flapped the paper on the table.v.intr.1. a. To move wings or the arms up and down.b. To fly by beating the air with the wings: The crow flapped away.2. To move or sway while fixed at one edge or corner; flutter: banners flapping in the breeze.
[Middle English flappe, slap.]Thesaurus| Noun | 1. |  flapping - the motion made by flapping up and downfluttering, flap, flutterundulation, wave - (physics) a movement up and down or back and forth |
IdiomsSeeflapflapping
flapping[′flap·iŋ] (metallurgy) Striking through the surface of molten copper to hasten oxidation by increasing the exposure to air. flapping The angular movement of a rotor blade above or below the plane of the hub. Blades ride higher and lower during their rotation, but they can do so only if they are allowed to move freely about a horizontal hinge or flexible root element. Design features allow for the blades to flap vertically about the flapping hinge. Blade flapping compensates for dissymmetry of lift as the retreating side flaps down resulting in increased angle of attack with consequent increase in lift. The advancing blade flaps up and the angle of attack reduces resulting in decreased lift.flappingA condition in which a route in a network becomes unavailable and available over and over again. See route dampening.flapping
Related to flapping: flapping tremorSynonyms for flappingnoun the motion made by flapping up and downSynonymsRelated Words |