vi.

1. （鸟）振翼，拍翅
2. （旗帜等）飘动，飘扬
   The flag fluttered in the breeze.

   旗帜在微风中飘动。

3. （脉搏，心脏）不规则跳动
   Her heart fluttered with fear.

   她因害怕心跳得厉害。

4. 焦急地乱动
5. 颤动；（激动得）发抖
   His fingers fluttered.

   他的手指颤动。

vt.

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

   雏鸟拍打着它的翅膀。

2. 使焦急，使不安
3. 使飘动

n.

1. 振翼；飘动[S]
2. 兴奋；激动；焦急[S]
   That TV play caused a mild flutter among the viewers.

   那出电视剧在观众中稍稍引起轰动。

3. 【英】【口】小赌；小投机[C][S1]
4. 【医】（心脏等的）扑动，振颤[C]
5. （录音机）放音失真，音频颤动[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.