MEANING/意义
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devoid of gratitude，forget one's kindness and turn one's back on him in returnType idiom/成语
忘恩负义
EXAMPLES/列句
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娶了媳妇忘了娘--忘恩负义
one forgets his mother after taking a wife--to be ungrateful; to bite the hand that feeds one -
我们过去常常帮助他，没想到他这么忘恩负义。
We often helped him in the past，there is no way we could expect him to be so ungrateful.
