kill someone with kindness
US /kɪl ˈsʌm.wʌn wɪð ˈkaɪnd.nəs/
UK /kɪl ˈsʌm.wʌn wɪð ˈkaɪnd.nəs/

1.
以德報怨, 用善意感化他人
to treat someone who is behaving badly to you in a very polite or kind way, so that you make them feel ashamed of their behavior and change it
:
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Instead of arguing back, she decided to kill him with kindness, offering to help with his project.
她沒有爭辯,而是決定以德報怨,主動提出幫助他的項目。
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My grandmother always taught me to kill them with kindness when someone is rude.
我奶奶總是教我,當別人粗魯時要以德報怨。