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Phrase(s): kill someone with kindness
Fig. to be enormously kind to someone. • You are just killing me with kindness. Why? • Don’t kill them with kindness.
McGrawhill's American Idioms And Phrasal Verbs
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Overwhelm or harm someone with mistaken or excessive benevolence. For example, Aunt Mary constantly sends Jane chocolates and cake and other goodies, even though she's been told Jane's on a diet nothing like killing with kindness. This expression originated as kill with kindness as fond apes do their young (presumably crushing them to death in a hug) and was a proverb by the mid-1500s.
American Heritage Idioms