take the liberty of doing sth 冒昧地做某事 =risk doing
eg. I don't want to take the risk (of) trying this. 我不想冒險去嘗試
(=I don't want to risk trying this.)
May I take the liberty of introducing myself to you？
我可以冒味地自我介紹嗎？

slip v. 1. 滑倒，滑脫
She slipped on the ice.她在冰上滑倒了。
I was unlucky to slip on a banana skin and fall over.我真倒霉，踩在香蕉皮上滑倒了。

2. 溜走
John felt it was a fat chance and he must never let it slip.
約翰認為這是一次好機會，決不能讓它溜走。

3. 匆忙地穿(或脫)(+on/off)
He slipped off his clothes and went into the bathroom.
他迅速脫掉衣服,走進浴室。

4. 塞入;暗中塞(錢等);把...塞給
He slipped the note into my hand.
他把紙條悄悄塞到我手里。

【詞義辨析】
slip, glide, slide, skid,
slip: 指不自覺地、偶然地滑動。
glide: 指自由、順暢地流動，也指不費力、無聲響地滑動。
slide: 通常多指與光滑表面保持接觸并且迅速地連續滑動。
skid: 著重指不自主地或失去控制地滑動，特指車輪在結冰或潮濕路面上的滑動，常暗含有危險存在的意味。

【詞語用法】
slip作名詞指“失誤”時，通常指“筆誤”。
That wasn't really a mistake. It was only a slip.
這算不上是一個錯誤，只是個筆誤罷了。
注意詞組slip of the pen和slip of the tongue中都要加定冠詞the。

錯句舉例與錯句分析
錯句：The tree trunks slipped down the mountain side to the river below.

糾正：The tree trunks slid down the mountain side to the river below.

翻譯：樹干從山坡滑進了下方的河里。

分析：slide指滑動，而slip指失足摔跤。