vi.

1. （鳥）振翼，拍翅
2. （旗幟等）飄動，飄揚
   The flag fluttered in the breeze.

   旗幟在微風中飄動。

3. （脈搏，心臟）不規則跳動
   Her heart fluttered with fear.

   她因害怕心跳得厲害。

4. 焦急地亂動
5. 顫動；（激動得）發抖
   His fingers fluttered.

   他的手指顫動。

vt.

1. 振（翼），拍（翅）
   The young bird fluttered its wings.

   雛鳥拍打著它的翅膀。

2. 使焦急，使不安
3. 使飄動

n.

1. 振翼；飄動[S]
2. 興奮；激動；焦急[S]
   That TV play caused a mild flutter among the viewers.

   那齣電視劇在觀眾中稍稍引起轟動。

3. 【英】【口】小賭；小投機[C][S1]
4. 【醫】（心臟等的）撲動，振顫[C]
5. （錄音機）放音失真，音頻顫動[U]

v.

1. fly unsteadily by flapping the wings quickly and lightly.
2. move or fall with a light irregular motion.
3. (of a pulse or heartbeat) beat feebly or irregularly.

n.

1. an act or instance of fluttering.
   ▸a state or sensation of tremulous excitement.
2. Brit. informal a small bet.
3. Electronics  rapid variation in the pitch or amplitude of a signal, especially of recorded sound. Compare with wow².
4. Aeronautics  undesired oscillation in a part of an aircraft under stress.