decelerate
词根词缀：
accelerate v. 加速，加快
ac 加强 + celer 快，迅速 + ate 做，造成，使… → 加速，加快
acceleration n. 加速（度）
accelerate的名词
accelerator n. 加速器
accelerate的名词
celerity n. 迅速，敏捷
celer 快，迅速 + ity 具备某种性质，状况 → 迅速，敏捷
decelerate v. 减速
de 减少 + celer 快，迅速 + ate 做，造成，使… → 减速
deceleration n. 减速（度）
decelerate的名词
decelerate v. 减速
de 向下；降低，减少 + celer 速度 + ate 做，造成，使… → 减速
declass v. 降低社会地位
de 向下；降低，减少 + class 社会等级 → 降低社会地位
depopulation n. 人口减少
de 向下；降低，减少 + population 人口 → 人口减少
depress v. 压抑
de 向下；降低，减少 + press 压 →〔把心情〕向下压 → 压抑
devalue v. 贬值
de 向下；降低，减少 + value 价值 → 减少价值 → 贬值
deplane v. 下飞机
de 离开 + plane 飞机 → 下飞机
derail v. 使（火车）出轨
de 离开 + rail 铁轨 → 使（火车）出轨
dethrone v. 退位
de 离开 + throne 王位 → 退位
detrain v. 下火车
de 离开 + train 火车 → 下火车
数据来源：新东方英语词汇速记大全
相关例句：
Consumer spending ispredicted to decelerate rapidly this year.
今年消费开支预计要迅速降低。
That suggests the Bank's stance will now be closer to that of the European Central Bank, which has held interest rates every month since June last year and still believes inflation will decelerate only gradually.
这意味着英国央行的立场目前更接近于欧洲央行（ECB）。自去年6月以来，欧洲央行每个月都维持利率不变，而且目前仍然相信，通胀率将会减速，但过程较为漫长。
As the body uncoils each segment should stop ( decelerate) as the next body segment accelerates.
正如身体解盘绕一般，当下一个身体片段加速的时候，当前的每一个片段应该停止（减速）。
PARMA is expected to make landfall at northern Luzon again tonight, and PARMA will decelerate as interaction diminishes.
预料芭玛将于今晚再度登陆吕宋，而随著两气旋的距离逐渐扩大，藤原效应的幅度将会减少。
But most analysts expect growth to decelerate this year to its slowest pace in more than two decades.
但多数分析师预计，中国经济增速将在今年放缓至20多年来最低的水平。
Widely watched indices of manufacturing and service sector activity for the US due for release this week are likely to confirm that the American economy continues to decelerate.
本周，美国将发布广受关注的制造业和服务业活动指数，这些数据有可能证实，美国经济正继续减速。