flap

名词 flap:

1. any broad thin and limber covering attached at one edge; hangs loose or projects freely
2. an excited state of agitation
   同义词：dither, pother, fuss, tizzy
3. the motion made by flapping up and down
   同义词：flapping, flutter, fluttering
4. a movable piece of tissue partly connected to the body
5. a movable airfoil that is part of an aircraft wing; used to increase lift or drag
   同义词：flaps

动词 flap:

1. move in a wavy pattern or with a rising and falling motion
   同义词：roll, undulate, wave
2. move noisily
3. move with a thrashing motion
   同义词：beat
4. move with a flapping motion
   同义词：beat
5. make a fuss; be agitated
   同义词：dither, pother
6. pronounce with a flap, of alveolar sounds

1. I got into a real flap when I lost my keys.
   我丢了钥匙，心里发慌。
2. The wind flapped the sails.
   风吹动着帆。
3. A flap from the tail of the whale upset the boat.
   鲸尾轻轻一拍便把小船打翻了。
4. The curtains were flapping at the open window.
   窗帘在敞开的窗户前摆动。

flap

n.（名词）
A flat, usually thin piece attached at only one side.
薄片：仅在一面扁平而且通常是很薄的片状物
A projecting or hanging piece usually intended to double over and protect or cover:
口盖：一种常用来折叠、保护或覆盖物体的突出物或垂下物：
例句：
the flap of an envelope.
信封的封盖

The act of waving or fluttering:
振动：摇动或振动的行为：
例句：
the flap of the flag in the wind.
风中旗帜的飘动

The sound produced by this motion.
拍打声，振动声：这种动作产生的声音
A blow given with something flat; a slap.
拍打：扁平物体的击打；拍击
A variable control surface on the trailing edge of an aircraft wing, used primarily to increase lift or drag.
襟翼：飞机后翼上最初用来增加上升力或拖力的可灵活控制的辅助翼
Either of the folded ends of a book jacket that fit inside the front and back covers.
向内折的边：书籍护套折进封面或封底的折叠端的任一端
Medicine 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.
【医学】 组织：部分切割下来的生物体组织，在外科移植中用以修补临近的身体缺陷处或在截肢后用来覆盖骨骼切除端
Informal A commotion or disturbance:
【非正式用语】 骚动，不安：
例句：
a flap in Congress over the defense budget.
由于国防预算引起的国会慌乱

v.（动词）
flapped,flap.ping,flaps
v.tr.（及物动词）
To wave (the arms, for example) up and down.
上下摆动（如手臂）
To cause to move or sway with a fluttering or waving motion.
使飘动：使…以飘动或摇动的状态移动或摆动
To hit with something broad and flat; slap.
拍打：用宽而扁平的物体击打；拍击
Informal To fling down; toss.
【非正式用语】 投掷；急抛
v.intr.（不及物动词）
To move or sway while fixed at one edge or corner; flutter:
飘动：一边或一角固定而移动或摇动；飘动：
例句：
banners flapping in the breeze.
旗帜在微风中飘扬

To wave arms or wings up and down.
上下摆动手臂，振翼
To fly by beating the air with the wings.
振翼飞行：用翅膀拍打空气而飞行
Informal To become upset or flustered.
【非正式用语】 烦躁不安：变得沮丧或慌乱

来源：
Middle English flappe [slap]
中古英语 flappe [拍打]