名詞 cloud:

1. any collection of particles (e.g., smoke or dust) or gases that is visible
2. a visible mass of water or ice particles suspended at a considerable altitude
3. out of touch with reality
4. a cause of worry or gloom or trouble
5. suspicion affecting your reputation
6. a group of many insects
   同義詞：swarm

動詞 cloud:

1. make overcast or cloudy
   同義詞：overcast
2. make less visible or unclear
   同義詞：obscure, befog, becloud, obnubilate, haze over, fog, mist
3. billow up in the form of a cloud
4. make gloomy or depressed
5. place under suspicion or cast doubt upon
   同義詞：defile, sully, corrupt, taint
6. colour with streaks or blotches of different shades
   同義詞：mottle, dapple
7. make milky or dull

1. The thick mist clouded the mountain-top.
   濃霧籠罩著山頂。
2. When there are black clouds you can tell it's going to rain.
   有烏云的時候，就知道快下雨了。
3. The sad news of her father's death was the only cloud on an otherwise happy year.
   她父親的死訊是她愉快的一年中唯一傷心的事。

cloud

n.（名詞）

A visible body of very fine water droplets or ice particles suspended in the atmosphere at altitudes ranging up to several miles above sea level.
云：十分細小的水滴或冰粒組成的可見的一團，懸垂于海面上高度達幾英里的大氣中
A mass, as of dust, smoke, or steam, suspended in the atmosphere or in outer space.
煙云，煙塵：灰塵、煙或蒸汽組成的一團，懸垂于大氣或外部空間
A large moving body of things in the air or on the ground; a swarm:
一群：空中或地面中大群的可移動的一團；一群：
例句：
a cloud of locusts.
一群蝗蟲

Something that darkens or fills with gloom.
黑暗，陰影：遮暗或充滿朦朧的某物
A dark region or blemish, as on a polished stone.
黑斑，瑕疵：黑塊或黑斑，如磨光的石頭上的黑斑
Something that obscures.
朦朧，昏暗：不清晰的東西
Suspicion or a charge affecting a reputation.
疑云，恥辱：影響聲望的疑問或控告
A collection of charged particles:
集合：電荷的聚集團：
例句：
an electron cloud.
電子團

v.（動詞）
cloud.ed,cloud.ing,clouds
v.tr.（及物動詞）
To cover with or as if with clouds:
使布滿云：被云或好象為云所覆蓋：
例句：
Mist clouded the hills.
霧遮住了山丘

To make gloomy or troubled.
使…朦朧不清：使變朦朧或陷入麻煩
To obscure:
使不清晰：
例句：
cloud the issues.
混淆爭端

To cast aspersions on; sully:
玷污：誹謗；玷污：
例句：
Scandal clouded the officer`s reputation.
丑聞玷污了官員的聲望

v.intr.（不及物動詞）
To become cloudy or overcast:
使多云，使陰暗：
例句：
The sky clouded over.
天空中云層密布

<習(xí)慣用語>in the clouds
Imaginary; unreal; fanciful.
空想的：想象的；不真實的；愛空想的
Impractical.
不切實際的
來源：
Middle English [hill, cloud]
中古英語 [山丘，云]
from Old English clôd [rock, hill]
源自 古英語 clôd [巖石，山丘]

【引伸】
cloud.less
adj.（形容詞）