translation help

[orentaub11]

can any one help me to to understand the meaning of the following expression?

From: orentaub4@gmail.com

吃定心丸

操心不见老

当面是人，背后是鬼

得理不让人

反呀一口

方事真的药事假的

敢悠不敢言

[skylee]

There seem to be some typos in the last three (see if the following corrections make sense) -

反呀(咬)一口 -> http://www.mdbg.net/...%B8%80%E5%8F%A3

方事(是)真的药事(是)假的 - the prescription is real but the medicine is not (it's a trick/scam)

敢悠(怒)不敢言 - dare not speak of one's anger/disapproval/disagreement

Others -

吃定心丸 -> http://www.mdbg.net/...%BF%83%E4%B8%B8

当面是人，背后是鬼 is similar to 表裡不一 (but in a more negative sense) -> http://www.mdbg.net/...%B8%8D%E4%B8%80

得理不让人 = 得理不饒人 -> http://news.hotpot.h...art_id=13141336

「得理不饒人」的「得理」，正式應解作「道理上勝過人家」，但不少人似乎解作「佔得上風」，英文怎樣翻譯，要看你怎樣解釋，例如：（ 1） He is very unforgiving when he finds others in the wrong（他得理不饒人）。（ 2） Once he gained the upper hand, he was very hard on me（他得理不饒人，處處難為我）。 To gain/ get the upper hand是成語，指「佔得上風」。

[orentaub11]

thank you very very much.