Definition
这是一个成语，字面意思是 '忘记恩情，违背道义'，用来指责那些受到别人帮助或恩惠后不但不感激，反而做出伤害施恩者的事情。它比单纯的 '不感恩' 语气更重，带有强烈的道德谴责色彩。在口语和书面语中都可以使用，通常用于批评某人的品行。
f.e.
to forget kindness and turn one's back on righteousnessto be ungrateful and betray the person who helped you
Examples
- ，，忘恩负义。Tā céngjīng bāng guò nǐ nàme duō máng, nǐ xiànzài què zhèyàng duì tā, zhēn shì wàng ēn fù yì.He helped you so much before, and now you treat him like this — truly ungrateful and disloyal.
- 忘恩负义，。Yí gè wàng ēn fù yì de rén, shì bú huì yǒu rén yuànyì zài bāngzhù tā de.No one will be willing to help a person who is ungrateful and betrays kindness.
- ，忘恩负义。Zhège túdì xuéchéng zhīhòu fǎn'ér xiànhài shīfu, jiǎnzhí shì wàng ēn fù yì.After mastering his skills, this apprentice framed his master — utterly ungrateful and treacherous.
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