改口的英文：
to correct oneself
to withdraw or modify one's previous remark

参考例句：

At that time, I was on a business trip going from Beijing to Guangzhou, I couldn't switch my saying in time.
当时我出差由京至穗﹐一时改口不及。

correct是什么意思：
adj. 正确的；端正的；合适的
v. 纠正，批改；调整，校准

corrected addendum
修正齿顶高

correction of leeway
风压差改正量

Their statement was correct.
他们的说法是对的。

withdraw是什么意思：
v. 抽回；移开；收回；提取；取消；撤销；撤退

withdrawal symptoms
ph.1. 戒毒过程中产生的病症(诸如盗汗、恶心等等)

to withdraw from a competition; to scratch
退出比赛

But this is seldom the cause for withdrawal from publication.
但是导致停止出版的情况则是很少的。