名詞 flap:

1. any broad thin and limber covering attached at one edge; hangs loose or projects freely
2. an excited state of agitation
   同義詞：dither, pother, fuss, tizzy
3. the motion made by flapping up and down
   同義詞：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
   同義詞：flaps

動(dòng)詞 flap:

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

1. I got into a real flap when I lost my keys.
   我丟了鑰匙，心里發(fā)慌。
2. The wind flapped the sails.
   風(fēng)吹動(dòng)著帆。
3. A flap from the tail of the whale upset the boat.
   鯨尾輕輕一拍便把小船打翻了。
4. The curtains were flapping at the open window.
   窗簾在敞開的窗戶前擺動(dòng)。

flap

n.（名詞）
A flat, usually thin piece attached at only one side.
薄片：僅在一面扁平而且通常是很薄的片狀物
A projecting or hanging piece usually intended to double over and protect or cover:
口蓋：一種常用來折疊、保護(hù)或覆蓋物體的突出物或垂下物：
例句：
the flap of an envelope.
信封的封蓋

The act of waving or fluttering:
振動(dòng)：搖動(dòng)或振動(dòng)的行為：
例句：
the flap of the flag in the wind.
風(fēng)中旗幟的飄動(dòng)

The sound produced by this motion.
拍打聲，振動(dòng)聲：這種動(dòng)作產(chǎn)生的聲音
A blow given with something flat; a slap.
拍打：扁平物體的擊打；拍擊
A variable control surface on the trailing edge of an aircraft wing, used primarily to increase lift or drag.
襟翼：飛機(jī)后翼上最初用來增加上升力或拖力的可靈活控制的輔助翼
Either of the folded ends of a book jacket that fit inside the front and back covers.
向內(nèi)折的邊：書籍護(hù)套折進(jìn)封面或封底的折疊端的任一端
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.
【醫(yī)學(xué)】 組織：部分切割下來的生物體組織，在外科移植中用以修補(bǔ)臨近的身體缺陷處或在截肢后用來覆蓋骨骼切除端
Informal A commotion or disturbance:
【非正式用語】 騷動(dòng)，不安：
例句：
a flap in Congress over the defense budget.
由于國防預(yù)算引起的國會(huì)慌亂

v.（動(dòng)詞）
flapped,flap.ping,flaps
v.tr.（及物動(dòng)詞）
To wave (the arms, for example) up and down.
上下擺動(dòng)（如手臂）
To cause to move or sway with a fluttering or waving motion.
使飄動(dòng)：使…以飄動(dòng)或搖動(dòng)的狀態(tài)移動(dòng)或擺動(dòng)
To hit with something broad and flat; slap.
拍打：用寬而扁平的物體擊打；拍擊
Informal To fling down; toss.
【非正式用語】 投擲；急拋
v.intr.（不及物動(dòng)詞）
To move or sway while fixed at one edge or corner; flutter:
飄動(dòng)：一邊或一角固定而移動(dòng)或搖動(dòng)；飄動(dòng)：
例句：
banners flapping in the breeze.
旗幟在微風(fēng)中飄揚(yáng)

To wave arms or wings up and down.
上下擺動(dòng)手臂，振翼
To fly by beating the air with the wings.
振翼飛行：用翅膀拍打空氣而飛行
Informal To become upset or flustered.
【非正式用語】 煩躁不安：變得沮喪或慌亂

來源：
Middle English flappe [slap]
中古英語 flappe [拍打]