flap

詳細解釋：

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：一種常用來摺疊、保護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：搖動或振動的行為：
例句：
the flap of the flag in the wind.
風中旗幟的飄動

The sound produced by this motion.
拍打聲，振動聲：這種動作產生的聲音
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：飛機後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.
向內折的邊：書籍護套折進封面或封底的摺疊端的任一端
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.
【醫學】 組織：部分切割下來的生物體組織，在外科移植中用以修補臨近的身體缺陷處或在截肢後用來覆蓋骨骼切除端
Informal A commotion or disturbance:
【非正式用語】 騷動，不安：
例句：
a flap in Congress over the defense budget.
由於國防預算引起的國會慌亂

v.（動詞）
flapped,flap.ping,flaps
v.tr.（及物動詞）
To wave (the arms, for example) up and down.
上下擺動（如手臂）
To cause to move or sway with a fluttering or waving motion.
使飄動：使…以飄動或搖動的狀態移動或擺動
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.（不及物動詞）
To move or sway while fixed at one edge or corner; flutter:
飄動：一邊或一角固定而移動或搖動；飄動：
例句：
banners flapping in the breeze.
旗幟在微風中飄揚

To wave arms or wings up and down.
上下擺動手臂，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]
中古英文 flappe [拍打]