简要回答
cloud是一个英语单词，作名词时意为云、云朵、云状物、阴影、忧郁、焦虑、令人忧虑的事，作动词时意为使难以理解、使记不清楚、使模糊、显得阴沉、看起来忧愁、混淆、搅混。
想要学习好英语，积累单词是首先需要做的，cloud是一个使用率非常高的词，那么下面就来跟大家说说cloud这个单词究竟是什么意思。
详细内容
cloud
英 [klaʊd] 美 [klaʊd]
n.云;云朵;云状物(如尘雾、烟雾、一群飞行的昆虫);阴影;忧郁;焦虑;令人忧虑的事
v.使难以理解;使记不清楚;使模糊;显得阴沉(或恐惧、愤怒等);看起来忧愁(或害怕、愤怒等);(尤指用无关的话题来)混淆，搅混(问题)
第三人称单数： clouds
复数： clouds
现在分词： clouding
过去式： clouded
过去分词： clouded
词语搭配
black/dark cloud 黑云/乌云
white cloud 白云
cloud of dust 一团灰尘
cloud of smoke 一团烟
cloud over 阴云密布；乌云翻滚 ；模糊不清
习语
every cloud has a silver lining
(saying) 黑暗中总有一线光明
every sad or difficult situation has a positive side
on cloud nine
(old-fashioned, informal) 极其快乐；乐不可支
extremely happy
under a cloud
有嫌疑；被怀疑
if sb is under a cloud , other people think that they have done sth wrong and are suspicious of them
have your head in the clouds
心不在焉；走神
to be thinking about sth that is not connected with what you are doing
有不切实际的想法（或计划等）；想入非非
to have ideas, plans, etc. that are not realistic
双语例句
The sky was almost entirely obscured by cloud.
天空几乎完全被云所遮蔽。
The hens darted away on all sides, raising a cloud of dust.
一群母鸡四处乱窜，搅起一团尘土。
Perhaps anger had clouded his vision, perhaps his judgment had been faulty
可能是愤怒蒙蔽了他的眼睛，也可能是他判断有误。
The mirror clouded beside her cheek
她面颊边的镜子变得模糊不清。
When Michael was born I was on cloud nine.
迈克尔出生的时候，我都乐得找不着北了。
The military are under a cloud for killing civilians while breaking up a demonstration.
军方因在平息示威活动时杀死了无辜平民而备受指责。
