go back on的音標為[g?u b?k ?n]，意思是“食言；違背；違反；背離”。

速記技巧：可以嘗試使用諧音記憶，例如“哥背單詞”。

"go back on" 是英語中的一個短語，意為“違背，食言”。這個詞組的詞源可以追溯到古英語，其中 "go" 意為 "to go" 或 "to come"；"back" 意為 "backward" 或 "against"；而 "on" 意為 "to" 或 "towards"。

這個詞組的變化形式有：單數形式的 "backbite"（背后中傷），復數形式的 "backslaps"（背后拍馬屁），以及過去分詞形式的 "backhanded"（背地里的）。

相關單詞有：

1. "trust"：這個詞與 "go back on" 相反，表示信任或依賴。例如，“I trust my friend with my life”表示我完全信任我的朋友。

2. "promise"：這個詞表示承諾或保證。例如，“He promised to do everything he could to help us”表示他承諾會盡一切努力幫助我們。

3. "betray"：這個詞表示背叛或出賣。例如，“He betrayed his country for personal gain”表示他為了個人利益背叛了他的國家。

以上這些單詞都與 "go back on" 這個詞組有密切的聯系，它們在語義和用法上都有相似之處。同時，這些單詞也反映了英語詞匯的多樣性和變化性。

常用短語：

1. go back on one"s word 違背諾言

2. go back on one"s commitments 食言

3. go back on one"s word of honor 背信棄義

4. go back on one"s promise 食言

5. go back to one"s past ways 舊病復發

6. go back to one"s old ways 故態復萌

7. go back and forth 來回往返

雙語例句：

1. He went back on his word of honor and betrayed his friend. (他背信棄義，背叛了朋友。)

2. She always goes back and forth between hope and despair. (她總是希望與絕望之間徘徊。)

3. He has been going back and forth between Beijing and Shanghai for years, always on business trips. (多年來他一直在北京和上海之間來回奔波，總是出差。)

英文小作文：

I remember when I was young, my parents always reminded me not to go back on my word. It taught me to be honest and trustworthy, which has helped me establish good relationships with others. However, sometimes we may face pressure or temptation to go back on our word, but I believe that integrity is the most important quality in life. It is essential to maintain our credibility and trustworthiness, even in the face of challenges and temptations. Therefore, I always try my best to keep my word and be a reliable person in my daily life and work.