降级的英文：
degrade

参考例句：

Transform Degrade
变换降级

To reduce in rank or rating;demote.
使降级降低级别或降级；使人降级

To reduce in rank;demote.
使降职，使…降级

He was degraded from the class.
他被降级了。

To degrade and reduce the degree of rank
贬谪降级

To reduce in grade, rank, or status; emote.
使降级，使降等在级别或地位上降低；使降级。

He was busted for being absent without leave.
他因擅离职守而被降级。

"downgrade, to (a loan)"
(对某一贷款)降级

Mr. Hunt was given an Irishman's promotion last year.
亨特先生去年被降级了

Reduction of an embassy to a liaison office
大使馆降级为联络处

degrade是什么意思：
v. 降低，贬低；（使）降解；（使）退化；（使）降级

The captain is degraded for disobey order.
这个上尉因不服从命令而被降级。

He was degraded from the class.
他被降级了。

Ecological degradation mainly includes degradation of terrestrial and aquatic ecosystems.
生态退化主要包括陆地生态系统和水域生态系统的退化。

Engage in degradation and arbitrage of foreign exchange
骗汇套汇

A dishonest action like that will degrade you.
像这样不诚实的行为会使你降低身份。