词典释义：
[with obj.](of a bird)move (its wings) up and down when flying or preparing to fly
（鸟）拍动（翅膀），振翅
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a pheasant flapped its wings 一只野鸡拍动着双翼
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[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
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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）
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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
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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）
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she flapped the duster angrily .她愤怒地乱舞了一通掸子。
[no obj.]
〈非正式〉 激动；焦虑不安；惊慌失措
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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
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the flap of the envelope 信封的封口
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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
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flaps are normally moved by the hydraulics 襟翼通常由液压装置驱动
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[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。
【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
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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
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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.]
〈非正式〉 激动；焦虑；惊恐，恐慌
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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。
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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
" Middle English： probably imitative. "
