- with obj.(of a bird) move (its wings) up and down when flying or preparing to fly（鸟）拍动（翅膀）, 振翅：
a pheasant flapped its wings
一只野鸡拍动着双翼
no obj. gulls flapped around uttering their strange cries.海鸥振翅飞翔, 叫声怪异。
- no obj.(of something attached at one point or loosely fastened) flutter or wave around（附着于一点或系得不紧的东西）摆动, 飘动, 飘舞：
the sides of the tent had a tendency to flap about.
帐篷的四面像要飘起来了。
- move (one's arms or hands) up and down or to and fro挥（臂）; 挥（手）。
- gesture at someone with (one's hand), especially in a dismissive way（用手）向某人示意（尤指示意退下）：
Bernice flapped a hand at him in dismissal.
伯尼斯向他挥了挥手, 让他离开。
- with obj. and adverbial of direction strike or attempt to strike (something) loosely with one's hand, a cloth, or a broad implement, especially to drive it away（尤指为驱赶而用手、布或扁平物）轻击; 拍打：
they flap away the flies with peacock tails.
他们用孔雀尾羽驱赶苍蝇。
- wave (something, especially a cloth) around or at something or someone四下挥舞（某物, 尤指布）; 朝着…挥舞（某物, 尤指布）：
she flapped the duster angrily.
她愤怒地乱舞了一通掸子。
- no obj. informal be agitated or panicky〈非正式〉激动; 焦虑不安; 惊慌失措：
it's all right, Mother, don't flap.
没事儿的, 妈妈, 不要慌张。
- a piece of something thin, such as cloth, paper, or metal hinged or attached on one side only, that covers an opening or hangs down from something（一端固定的布条、纸或金属件等）片状垂悬物; 片状封口物：
the flap of the envelope
信封的封口
he pushed through the tent flap.
他掀开帐篷的门帘走了进去。
- a hinged or sliding section of an aircraft wing used to control lift（飞机的）襟翼：
flaps are normally moved by the hydraulics
襟翼通常由液压装置驱动
mass noun a final approach at sixty knots with 45° of flap.襟翼45°、速度60节的进场着陆。
- a large broad mushroom伞形菇。
- Phonetics a type of consonant produced by allowing the tip of the tongue to strike the palate very briefly【语音】闪音。
- a movement of a wing or an arm from side to side or up and down（翅膀的）振动; （手臂的）挥动：
the surviving bird made a few final despairing flaps.
那只幸存下来的鸟最后绝望地抖动了几下翅膀。
- in sing. the sound of something making such a movement翅膀的振动声; 手臂的挥舞声：
hear the coo of the dove, the flap of its wings.
听着鸽子的咕咕叫声, 听着它双翅的拍动声。
- in sing. informal a state of agitation; a panic〈非正式〉激动; 焦虑; 惊恐, 恐慌：
they're in a flap over who's going to take Hugh's lectures.
他们因不知谁会受休的训斥而焦虑不安。
someone's ears are flapping
- informal someone is listening intently and in a nosy and intrusive way〈非正式〉好管闲事地无礼偷听：
your ears are flapping, Mr O'Brien!
你在偷听吧, 奥布赖恩先生。