1. vi. & vt.振翼，拍翅膀　(of the wings of birds) move lightly and quickly; move (the wings) in this way
2. vi.飘动　move about in a quick irregular way
3. vi.（心）快速跳动　(of the hear) beat weakly and irregularly

　～ about　摆动，坐立不安
　～ down　飘摇而下
　～ among　在…中飞来飞去
　～ at　向…飘动
　～ in the breeze　在风中飘动
　～ past the window　从窗前飘过
　～ round　绕…飘
　～ to the ground　落到地上

　I could hear the birds' wings fluttering on the roof.　我能听到鸟的翅膀在屋顶上拍打。
　The birds fluttered in the trees.　鸟在林中飞。
　The colored flags are fluttering in the breeze.　彩旗在微风中飘扬。
　His heart fluttered with excitement.　他因激动而心跳得厉害。
　The bird fluttered its wings in the bird's nest.　小鸟在巢里拍动翅膀。
　She fluttered her eyelashes at him.　她对他眨眼。
　She fluttered her handkerchief from the train window as a goodbye.　她从火车车窗向外挥动手帕告别。

 ♣ flutter about　(v.+adv.)
1. 拍翅膀 fly with light movements of wings
　There is a bird fluttering about inside the chimney. How can we get it out?　烟囱中有一只鸟在拍打翅膀，我们怎么把它弄出来?
2. 焦虑地乱动 move with quick nervous movements
　The women were all fluttering about finishing their preparations for the wedding.　女人们做好婚礼准备后显得不安。
 ♣ flutter down　(v.+adv.)
　飘落　descend in light twisting movements
　It was autumn, and leaves were fluttering down in the light wind.　现在是秋天，树叶在微风中飘落下来。

 ♣ flutter, flit, flitter
　这三个词都表示以类似鸟那样的运动方式来移动。其区别在于：flutter强调不稳定性和颤动性；flit强调轻快、迅速；而flitter则兼而有之。

S 紧张，激动不安state of nervous or confused excitement

　make a ～　引起不安
　wing ～　机翼颤动
　in a ～　坐立不安
　～ of wings　翅膀的振动

　She was in a great flutter about traveling by airplane.　她对于乘飞机旅行感到紧张。
　He felt a flutter of excitement.　他感到一阵激动。

　［词源］古英语floterian（来回飘动）