失言的英文：
a slip of the lip
be false to one's word
drop a brick
drop a clanger
eat one's hat
eat one's words
faux pas

参考例句：

A revealing slip of the tongue,disclosure,comment
暴露真相的失言、揭发、评论

I dropped a brick when I told that joke about the pope—I didn't realize that Alex was a staunch Roman Catholic.
当我讲了那个有关罗马天主教教皇的笑话时，我失言了——我没意识到亚历克斯是一位虔诚的罗马天主教徒。

Better slip with foot than with tongue.
宁可失足，也不失言。

He has an unfortunate aptitude for saying the wrong thing.
他有失言的倒霉本事.

It was an indiscretion that blasted his good reputation.
是一次失言损毁了他的好名声。

That unfortunate remark exposed his ignorance of the subject.
那次失言暴露了他对该学科的无知。

He put his foot in it when he told the Boss he figured wrong.
"当他告诉老板说他算错时,他失言了。"

He saw he had made a blunder, so he hastened to explain it away
他知道自己一时失言，于是赶紧支支吾吾地解释。

The Duke, though a courtier, colored slightly on hearing this, and the Queen, was instantly sensible of her error
公爵虽说是一个朝臣，听了这话也不免感到脸红。王后也立刻意识到自己失言。

slip是什么意思：
v. 滑动；滑倒；滑落；溜；出错；下降；陷入；错过；摆脱；放开；塞；被泄露
n. 溜；失误；过错；衬裙；滑倒；片，条；下降；事故；瘦小的年轻人
adj. 滑动的，活络的；打有活结的；可拆卸的
abbr. 串行线路接口协议（Serial Line Interface Protocol）

This is not a slip, but lingerie.
这不是衬裙，而是睡衣。

a slip of paper
一张纸条

That was a slip of the pen.
那是笔误。

false是什么意思：
adj. 错误的；不真实的；人造的；假的；不诚实的；不忠诚的

This assumption is false in several ways.
这种推断是错误的，错在了多个方面。

The statement is manifestly false.
这种说法明显不确。

An act or instance of such falseness.
这种假装的行为或实例。

one是什么意思：
num. 一；同一个、最重要的一个
det. 代替a或an，表示强调；某位（用于不太熟悉之人的姓名之前）
pron. 任何人；一个人；一个事物；其中的一个人

One, Taipei, one way.
台北单程票一张。

This one is not a spoof.
这个就不是开玩笑了。

One and one make(s) two.
一加一等于二。