1 General Lü Meng 呂蒙|吕蒙 of the southern state of Wu (idiom); model of self-improvement by diligent study (from unlettered soldier to top strategist of Wu)
忘恩负义
wàng ēn fù yì
1 to forget favors and violate justice (idiom); ingratitude to a friend
2 to kick a benefactor in the teeth
恩同再造
ēn tóng zài zào
1 your favor amounts to being given a new lease on life (idiom)
恩威兼施
ēn wēi jiān shī
1 to employ both kindness and severity (idiom)
恩将仇报
ēn jiāng chóu bào
1 to bite the hand that feeds one (idiom)
恩比天大
ēn bǐ tiān dà
1 to be as kind and benevolent as heaven (idiom)
感恩图报
gǎn ēn tú bào
1 grateful and seeking to repay the kindness (idiom)
蒙在鼓里
méng zài gǔ lǐ
1 lit. kept inside a drum (idiom)
2 fig. completely in the dark
知遇之恩
zhī yù zhī ēn
1 lit. the kindness of recognizing sb's worth and employing him (idiom)