音标：[di'kei] ；柯林斯词典等级：2 级；牛津三千核心词汇；

n. 衰退, 腐败
v. (使)衰退, (使)腐败

n. the process of gradually becoming inferior
n. a gradual decrease; as of stored charge or current
n. the organic phenomenon of rotting
n. an inferior state resulting from the process of decaying

词型变化：现在分词 : decaying ; 过去分词 : decayed ; 第三人称单数 : decays ; 名词复数形式 : decays ; 过去式 : decayed
考试类型：[四级/六级/考研/托福/IELTS]

词性分布：

名词71%

动词29%

decay的用法和样例：

例句

用作动词(v.)

Naomi: Your entire body is begining to decay.直美:你的整个身体都在衰退。
What made the Roman Empire decay?罗马帝国为何衰亡？
The dampness of the climate decayed the books.气候潮湿，把书都霉坏了。
The vegetables have begun to decay.那些蔬菜已开始腐烂。

用作名词(n.)

His mental decay is distressing.他的智力衰退令人苦恼。
Bacteria complete the job by causing decay.细菌通过引起腐烂而完成这个变化。
The dentist could detect no decay in her teeth.牙医检查了她的牙，未见有龋齿。

常见句型

用作名词(n.)

The decay of the meat could have been prevented by proper refrigeration.如果经过适当的冷藏，这些肉本来不至于腐烂掉。
The decay had not proceeded very far.腐烂的还不算厉害。
The corpse was preserved from decay by embalming.尸体用香料涂抹以防腐烂。
Dental decay in children in Britain has almost reached epidemic levels.在英国，儿童蛀牙之普遍几乎达到了流行病的程度。
Neglect has accelerated this house's decay.这栋房子因没有人管理而加快损坏。
That university has fallen into decay in the last 50 years.那所大学在过去的50年逐渐没落了。
The buildings had started to fall into decay.建筑物开始衰败。
This industry has been in decay for some time.这一工业进入衰败期已有一段时间。

用作动词(v.)

用作不及物动词S+～(+A)

The cabbages had already started to decay.卷心菜已经开始烂了。
They claimed that the plastics wouldn't decay if they were buried.他们声称塑料被埋起来就不会腐烂。
Facilities built in the 1960s have started to decay.建于20世纪60年代的设施开始损坏了。
The role of the extended family has been decaying for some time.大家庭的作用已开始在一段时间内有所减退。
The human world, being what it is, could only decay in the course of time.人类的世界，就其现状而言，最终非衰败不可。

用作及物动词S+ ～+n./pron.

Pollution has decayed the surface of the stonework on the front of the cathedral.污染已腐蚀了教堂前部的石头雕塑。

其他

She smelt the unpleasantly sweet smell of decaying meat.她闻到了肉类腐烂发出的变质臭味。

词汇搭配

用作名词 (n.)

形容词+～

bacterial decay细菌性腐烂
creeping political decay政治上的逐渐腐败
dental decay牙齿龋蚀
mental decay智力衰退
moral decay道德沦丧
premature decay早衰
radioactive decay放射衰败

名词+～

tooth decay牙齿龋蚀

经典引文

If thy brother bee waxen poore, and fallen in decay with thee.
出自：Bible (AV): Leviticus
The decay of our civilization,..a break-down of social structures and..a drying-up of the emotional springs of life.
出自：R. G. Collingwood
Ancient..families..decayed..into the humble vale of life.
出自：Sir W. Scott
Impoverished widows and spinsters of the middle classes..were officially described as 'decayed gentlewomen'.
出自：John Gloag

【近义词】

rot
spoil

【反义词】

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学英语单词

a-homered

acute bacillary dysentery